Final answer:
The correct foot alignment when doing upstretch is to lower the sole of the foot to the ground, maintain posture while walking, and assist in moving the back of the lower legs up and back toward the buttocks.
Step-by-step explanation:
The correct foot alignment when doing upstretch is to lower the sole of the foot to the ground, as when foot-tapping or jumping. This alignment helps to maintain posture while walking and assists in moving the back of the lower legs up and back toward the buttocks.
It is important to ensure that the foot is properly aligned and not turned inward or outward to prevent any strain or injury.
By maintaining correct foot alignment during upstretch, you can engage the appropriate muscles and optimize the effectiveness of the exercise.