Final answer:
In Warrior 1 and Warrior 2 poses, the back foot is positioned in a movement called plantar flexion, which is the lowering of the sole of the foot to the ground.
Step-by-step explanation:
In Warrior 1 and Warrior 2 poses, the back foot is positioned in a movement called plantar flexion. Plantar flexion is when the sole of the foot is lowered to the ground, like when tapping the foot or jumping. It also assists in moving the back of the lower legs up and back toward the buttocks.