Posture is essential in all sports.
Once a client said to me “This is like in snowboarding – we always talk about alignment”. As we do in riding, cycling, running.
Core stability is an “overused” phrase, but it explains everything. Hold yourself up, no leaning or resting or slouching.
Strengthen the core so that the trunk supports itself and the limbs can move independently without locking areas of the body which then prevents free movement, like ballroom dancing.