Hence a favourable posture of the limb for eliciting the jerk is one ensuring relaxation of the hamstring muscles, as when the leg has been crossed upon the other.
So a machine and a workout that gives you the most effective glute and hamstring workout available, while also allowing you to target your lower back and your core is a big plus.
Adding extra hamstring exercises can correct this muscular imbalance.
Extend your front knee and lean your torso forward until you feel a good stretch in the hamstring of your extended knee; you'll probably also feel a stretch in your lower back.
Even team sports like volleyball, softball, and basketball benefit from the hip, back, and hamstring flexibility that you gain from the skill.