turning the waist first?

[Tack]

I am writing a tip for ball games.

When you play any of ball games, Baseball, Golf, or Tennis, it is generally important to turn your waist first before start swinging your arm. Tuning the waist initiates smooth and sound movement of the body to hit a ball on the axis of rotation.

Question:
The phrase "Turn your waist first" sounds OK? How “rotating your waist”, or “moving from your waist” sound like?

[billmcd]

I am writing a tip for ball games.

When you play any type of ball games such as Baseball, Golf, or Tennis, it is generally important to rotate your waist first before start swinging your arm(s). Turning the waist initiates smooth and sound movement of the body to hit a ball on the axis of rotation.

Question:
The phrase "Turn your waist first" sounds OK? How “rotating your waist”, or “moving from your waist” sound like?

See above suggestions for the statement, however I don't necessarily agree with your recommendation. My "experience", in the sports you mention, is that the hip rotation and the swing should occur simultaneously, but perhaps that's what is wrong with my game.

[BobK]

I think I'd say 'turn from the waist' or 'turn at the waist'. (After a Tai Chi class I might say 'lead with the tan-tien')

b

[5jj]

After a Tai Chi class I might say 'lead with the tan-tien'

We black belts (seventh dan) in ori-gami strive not to move at the waist at all.

[Tack]

We black belts (seventh dan) in ori-gami strive not to move at the waist at all.

That's interesting. I've been moving at the waist sharply when I do Origami.