They need flexibility in their hips mostly. Flexibility refers to the ability to move a joint and the surrounding mucles through a full range of motion. Flexibility is critical in football because of the joint stress associated with dynamic multi-joint movements.
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Consider some of the situations a player will/potentially will find themselves. In the scum as a simple instance the hooker will need to slightly turn their body , bend at the wait so that their head is frequently below their waist line, turn their head to face the open side prop where the scrum half will be putting the ball in. A second Row has to jump, with some assistance and turn in the air at the waist or stretch to reach for a ball being thrown in. being tackled. The player being tackled needs to fall as safely as possible and will need to twist to make the ball available for their team mates following. A tackler must ensure that they position themselves in manner that does not cause them to be injured when they hit the ground. Running and swerving with the ball requires a central flexibility to allow the body to be moving in one direction and suddenly turn to another
Flexibility is needed in order to turn quickly and is needed
for certain tackles.