Increase hip-shoulder separation to throw or hit harder?!

This trend is seen in all sports where it is necessary to send an object in a powerful way. It is a MISTAKE!

Athletes use a hip or a shoulder strategy to accelerate their movements.

This has to do with the question of where the spine is most flexible, having a high mobile point (shoulders & pelvis can rotate independently) or a low mobile point (shoulders & pelvic work in synergy)