4 reason's you can't keep your head still on contact

[@TennisHacker]

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[@wiggi9339]

Fantastic insight. Thanks.

[@huntsail3727]

Good tips. Thanks!

[@theemperorofsocks4051]

4 reason's ✖️ 4 reasons ✔️

[@gydscutroo9973]

It’s not really “hard to do” at all. It’s hard to groove (i.e. to make it an unconscious habit). Takes a gajillion mindfully focused reps.