Amazing, I will never see people the same way, same with jumps and parkour in general!! Your videos are so interesting!!! YOU DESERVE MORE SUBSCRIBERS!!!! My advice would be to make HD videos, even 720p in fine, and nothing else you need to change. YOur audio is good as well. The ting is you are bringing a whole new perspective of parkour in the parkour community, and you explain what rules all movments and interaction between objects, thus you explain what rules parkour! And you teach us to better understand the essensial of parkour. People in their tutorial explain it probabily unconsciously and in other ways, but you get to the core of it all!! I will keep watching your videos! They are really interesting! You just won a subscriber1
The roll turned out to be the most amazing and complex work of my research and took up more then a third of my research time and findings... I will certainly make a video (or many) for it but I would like to get through a few more of the simpler moves first. Glad they are helping :) that's what I like to hear.
You are correct... the timing of your tuck has a direct effect on the angle of landing and as such on both balance and distance. I didn't bring it up in the video because I have personally never taught or met someone who mistimed their tuck (usually they just forget to tuck altogether) beginning tucking very soon after take off is important for getting the required rotation for the control and max distance. Thanks for the good point.
Hi guy, i really enjoy your explanations about the Precision jump. Great job :)... I would like to see a ParkourScience about Landing techniques and the impact on the boddy ! Keep it up :)
Yes the stop of the arm swing does partially cause that back arch you are correct. It feels like it gives upward momentum but doesn't really. I expected what you do before the research but ended up disproving that hypothesis when doing experimentation and isolating the motions. It wasn't as surprised once I broke down the free body diagram though. Also After my research I also found a japanese published bio-mechanical study on this type of jump and they found the same results.
Love this series! I'm not sure I agree regarding the arm swing though, during the jump. The legs may have a limit to how much force they can generate, but there is a variable here, which is how long that force is applied. (This is the converse of the impact/impulse concept in your landing videos.) Assume that the legs exert a fixed force for the entire time starting from the bottom of the crouch through the feet leaving the ground (I'm sure this isn't exactly true, but let's assume). When jumping, there is the (upward) normal force from the ground to the legs, and the (forward) frictional force from the ground to the legs. By swinging the arms up, there is an additional set of forces - the body pushing the arms up, and the arms pushing the body down. The downward force on the lower body will keep the lower body closer to the ground for longer than it would have been without the arm swing. This gives the feet/legs more time touching the ground while the arms and upper body extend, until the point when the upper body can't extend any more and the lower body has to start extending, and then the feet finally leave the ground. The end result is that the fixed force of the legs is applied for a longer period of time, leading to more momentum. Am I thinking about this incorrectly? Zach
Thanks! I see what you are trying to get at but yes unfortunately you are thinking about this incorrectly. I think the best way for me to explain is with a thought experiment/analogy. If what you say is true that having the downward resulting force of the arm swing increases time for the legs to exert force. (it doesn't but we will use it as a starting assumption) well downward force from arm swing is no different from a physics perspective as weight (except in that it varries and drops off). If you jumped while holding a weight and then let it go (aka make it too vary and drop off) as you left the ground would you fly higher then you would with no weight in the first place? Hopefully that seems like an obvious no. The key issue is when you look at impulse it is related to time as well as distance in a related manner. the distance to consider though is center of mass to bottom of feet. No amount of arm swing will increase leg length or force capability of the leg muscles, and as such the only way to vary time is with less force (which naturally results in a slower take off and less height). Though now it seems obvious to me I must admit, I was myself a bit surprised when I worked out the dynamics and discovered that the arm swing only effected center of mass placement and not directly height. So I got a second opinion (always good to double check results) and this concept has been shown and proven many times by bio-mechanics experts. Hope this helps.
Yep. The reason is purely in that the strong arm swing allows your body to line up with your legs so that you get far more distance for your leg power without the arm swing a lot of the leg energy ends up wasted due to the failure in the alignment.
It's not particularly relevant to landing angle (though flexibility may play a part there) but keeping the back straight will usually not allow for maximum power and distance.
The next thing you should break down/explain the Physics of is the roll These video really help explain what I'm doing wrong and how to get the max out of each "movement"
keep in mind with the equal and opposite reactions that when you swing your arms weight back you effectively swing your shoulders forward and equal amount. So this would only help once the entirety of the jumps momentum was dissipated. In other words, swinging your arms can help you keep balance after you are steady but not help you gain balance on the landing, for that your center of mass must intersect the landing point.
Part 2 will cover the landing of running precisions fairly well and at some point I will also be making a video on the physics of the running jumps. :)
I have to disagree with what you see about the arms, although perhaps you can debunk me on this one. What I've found is that the pendulum swing from the arms DOES allow the body to get in the 45 degree angle, but it also creates a large amount of forward momentum in itself, along with tensing in the lower back muscles (you can see Josh's back arch a good amount). I may be wrong in what I've experienced, but I've found a strong swing can lift the body on it's own without legs at all at least some
I will cover plyos in a video later on, on the physics of continuation of motion or something along those lines. For now I can tell you the physics is very similar with only a few key differences... the next video I will mention the intersection of the parabola with the landing point and aiming your hips there... for a plyo you will want to aim your hips about 6 inches in front of your foot placement instead.
Have you considered the effect the timing of the tuck may have on distance? I have this friend who never tucked in his precisions, he's got pretty beastly leg power but he could never jump as far as me. I told him about tucking at the right time, and he improved his precision distance by about a foot. Personally, I feel my precisions and monkeys are more efficient when I tuck at the right time, could it have something to do with moving the mass of the legs at the right time?
hm... after some experimenting you might be right, even if it's kind of counter intuitive to me. its just interesting then that the arm swing makes such a huge difference if it's not creating any momentum on it's own. I feel like if the arms and back aren't creating any momentum, then theoretically it would be possible to jump just as far with a weak arm swing timed correctly, but I don't think that's true... do you see what I mean?
I am not a doctor. That said, I have spoken to some of the top experts in the field of knee health and medicine and have been told no. As it was explained to me you actually relieve a lot of stress on the joint when you bend past 90 degrees (despite many myths out there on the internet.) If you already have a knee injury this is a whole other matter, but for a person with healthy knees, no bending too far is not actually bad for your knees.
Amazing, I will never see people the same way, same with jumps and parkour in general!! Your videos are so interesting!!! YOU DESERVE MORE SUBSCRIBERS!!!!
My advice would be to make HD videos, even 720p in fine, and nothing else you need to change. YOur audio is good as well. The ting is you are bringing a whole new perspective of parkour in the parkour community, and you explain what rules all movments and interaction between objects, thus you explain what rules parkour! And you teach us to better understand the essensial of parkour. People in their tutorial explain it probabily unconsciously and in other ways, but you get to the core of it all!! I will keep watching your videos! They are really interesting! You just won a subscriber1
I love how detailed you make everything. It's great! Keep it up!
The roll turned out to be the most amazing and complex work of my research and took up more then a third of my research time and findings... I will certainly make a video (or many) for it but I would like to get through a few more of the simpler moves first. Glad they are helping :) that's what I like to hear.
You are correct... the timing of your tuck has a direct effect on the angle of landing and as such on both balance and distance. I didn't bring it up in the video because I have personally never taught or met someone who mistimed their tuck (usually they just forget to tuck altogether) beginning tucking very soon after take off is important for getting the required rotation for the control and max distance. Thanks for the good point.
Hi guy, i really enjoy your explanations about the Precision jump. Great job :)... I would like to see a ParkourScience about Landing techniques and the impact on the boddy !
Keep it up :)
Yes the stop of the arm swing does partially cause that back arch you are correct. It feels like it gives upward momentum but doesn't really. I expected what you do before the research but ended up disproving that hypothesis when doing experimentation and isolating the motions. It wasn't as surprised once I broke down the free body diagram though. Also After my research I also found a japanese published bio-mechanical study on this type of jump and they found the same results.
Love this series!
I'm not sure I agree regarding the arm swing though, during the jump. The legs may have a limit to how much force they can generate, but there is a variable here, which is how long that force is applied. (This is the converse of the impact/impulse concept in your landing videos.) Assume that the legs exert a fixed force for the entire time starting from the bottom of the crouch through the feet leaving the ground (I'm sure this isn't exactly true, but let's assume). When jumping, there is the (upward) normal force from the ground to the legs, and the (forward) frictional force from the ground to the legs. By swinging the arms up, there is an additional set of forces - the body pushing the arms up, and the arms pushing the body down. The downward force on the lower body will keep the lower body closer to the ground for longer than it would have been without the arm swing. This gives the feet/legs more time touching the ground while the arms and upper body extend, until the point when the upper body can't extend any more and the lower body has to start extending, and then the feet finally leave the ground. The end result is that the fixed force of the legs is applied for a longer period of time, leading to more momentum.
Am I thinking about this incorrectly?
Zach
Thanks! I see what you are trying to get at but yes unfortunately you are thinking about this incorrectly. I think the best way for me to explain is with a thought experiment/analogy. If what you say is true that having the downward resulting force of the arm swing increases time for the legs to exert force. (it doesn't but we will use it as a starting assumption) well downward force from arm swing is no different from a physics perspective as weight (except in that it varries and drops off). If you jumped while holding a weight and then let it go (aka make it too vary and drop off) as you left the ground would you fly higher then you would with no weight in the first place? Hopefully that seems like an obvious no. The key issue is when you look at impulse it is related to time as well as distance in a related manner. the distance to consider though is center of mass to bottom of feet. No amount of arm swing will increase leg length or force capability of the leg muscles, and as such the only way to vary time is with less force (which naturally results in a slower take off and less height). Though now it seems obvious to me I must admit, I was myself a bit surprised when I worked out the dynamics and discovered that the arm swing only effected center of mass placement and not directly height. So I got a second opinion (always good to double check results) and this concept has been shown and proven many times by bio-mechanics experts. Hope this helps.
Yep. The reason is purely in that the strong arm swing allows your body to line up with your legs so that you get far more distance for your leg power without the arm swing a lot of the leg energy ends up wasted due to the failure in the alignment.
very helpful video!.. love how physics are explained. Please make a video on how to most efficiently land to stop momentum minimizing impact....
awesome! When are you going to release part 2?
Would you say that swinging the arms back after landing the jump will help prevent someone from going too forward?
Can you include a maximum jumping distance formula like the max wall run formula?
Can you do one on various vaults?
It's not particularly relevant to landing angle (though flexibility may play a part there) but keeping the back straight will usually not allow for maximum power and distance.
The next thing you should break down/explain the Physics of is the roll
These video really help explain what I'm doing wrong and how to get the max out of each "movement"
keep in mind with the equal and opposite reactions that when you swing your arms weight back you effectively swing your shoulders forward and equal amount. So this would only help once the entirety of the jumps momentum was dissipated. In other words, swinging your arms can help you keep balance after you are steady but not help you gain balance on the landing, for that your center of mass must intersect the landing point.
Part 2 will cover the landing of running precisions fairly well and at some point I will also be making a video on the physics of the running jumps. :)
I have to disagree with what you see about the arms, although perhaps you can debunk me on this one. What I've found is that the pendulum swing from the arms DOES allow the body to get in the 45 degree angle, but it also creates a large amount of forward momentum in itself, along with tensing in the lower back muscles (you can see Josh's back arch a good amount). I may be wrong in what I've experienced, but I've found a strong swing can lift the body on it's own without legs at all at least some
I will cover plyos in a video later on, on the physics of continuation of motion or something along those lines. For now I can tell you the physics is very similar with only a few key differences... the next video I will mention the intersection of the parabola with the landing point and aiming your hips there... for a plyo you will want to aim your hips about 6 inches in front of your foot placement instead.
Thanks. This corrected my mistake of starting with my feet together. The tutorial vids I saw didn't address that.
will this also cover plyos?, or no, because of its similarity to a standard precision?
Have you considered the effect the timing of the tuck may have on distance? I have this friend who never tucked in his precisions, he's got pretty beastly leg power but he could never jump as far as me. I told him about tucking at the right time, and he improved his precision distance by about a foot. Personally, I feel my precisions and monkeys are more efficient when I tuck at the right time, could it have something to do with moving the mass of the legs at the right time?
hm... after some experimenting you might be right, even if it's kind of counter intuitive to me. its just interesting then that the arm swing makes such a huge difference if it's not creating any momentum on it's own. I feel like if the arms and back aren't creating any momentum, then theoretically it would be possible to jump just as far with a weak arm swing timed correctly, but I don't think that's true... do you see what I mean?
The derivation was proving troublesome... If I figure it out I will be sure to include it in part 2.
Nice video.
Working on it now, just finished moving and getting a new laptop so I am a bit behind. soon. :)
can precisions damage your knees by bending your legs to much.
I am not a doctor. That said, I have spoken to some of the top experts in the field of knee health and medicine and have been told no. As it was explained to me you actually relieve a lot of stress on the joint when you bend past 90 degrees (despite many myths out there on the internet.) If you already have a knee injury this is a whole other matter, but for a person with healthy knees, no bending too far is not actually bad for your knees.
I definitely will do.
Very nice
can put subtitles in Spanish?
Our body and mind are really amazing , we all know how to do it without knowing why we do it:p
That is one of my favorite parts of the research, realizing how incredible we are naturally.