Leg Extension - Stability Ball
Other types of Leg Extension: Bodyweight Machine
Assume the active sitting position on the ball with your feet hip width apart.
Lift one knee one inch and extend your lower leg aiming to get your knee straight. Bend your knee to 90 degrees then lower your foot to the floor.
Rectus femoris, Vastus medialis, Vastus intermedius, Vastus lateralis
TIP: Think of lengthening your lower back as you lift and as you lower the leg.
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