All you need is a bench or a sturdy chair to do the step-up:
- Place your right foot firmly on the bench with your left foot directly under your left hip.
- Step up, straightening your right leg, bringing both feet completely onto the bench. Slowly bend your right knee, lowering the ball of your left foot back to the ground, keeping your right thigh engaged. For a more advanced version, you can kick the left knee up as you step up. Complete three sets of 15-20 reps on each leg.