Stand by the side of the pool and hold the edge with straight arm. Keep your back straight as well. Step on the noodle with your far foot. Raise your knee at your hip level and keep it bent at about 90 degrees.
With the noodle under your foot, kick your knee back and front. Keep your hip still and push in both directions.
Inhale with one knee extension and flexion, then exhale with the other.
Feel your quadriceps as you extend your knee and your hamstring as you bend.
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