Young baseball pitchers who do not have proper trunk rotation sequence while pitching may have an elevated risk of shoulder injury due to greater forces and angles placed on the joint, according ...

Improper Rotation = Reflection + Rotation A pentagonal antiprism with directional edges is invariant under improper rotation (in the example above, rotation by a tenth of a circle, and reflected ...

Improper rotation, spine is not straight. Proper rotation, with straight spine. Ideally, the waist bend and spine rotation happen simultaneously in a fluid stroke.

A slice comes from only one condition: The clubface is open at impact, which puts cut spin on the ball. One of the most common causes of this open clubface is improper rotation of the upper body ...