One hand in your pocket. That's the entire drill, and it's the fastest way I've found to actually feel where smash power comes from instead of just being told about it.

Taking the Arm Out Removes the Fake

Take the non-racket arm out of the swing completely and you can't fake a smash anymore. Normally that free arm does a lot of quiet work — pulling down, adding rotation, making a weak hit look more committed than it actually is. It's easy to lean on it without noticing, especially when you're tired or rushing a shot. Tuck it in your pocket and all of that disappears. What's left has to do the job on its own: the forearm snapping at the top of the swing, and the chest turning through the shot. If either one is missing, you feel it immediately, because there's nothing else left to cover for it — the shuttle just doesn't go anywhere.

Putting the Jump Back On

Once that forearm snap and chest turn start showing up on their own, hands come back out and the jump goes back on top. The point isn't to hit in slow motion with one arm tucked away forever — it's to lock in the pattern with the arm removed first, so the source of the power is unmistakable before you add anything else back in. When the jump and the free arm return, the power source doesn't change. It just gets more to work with, instead of the arm quietly taking over again.

This one's easy to slot into a normal session — save it for your next feeding drill and run a set with the hand in your pocket before you hit at full speed with everything back on. Watch the full clip below.