Place your right foot firmly on the table with your left foot directly under your left hip.
Step up, straightening your right leg, bringing both feet completely onto the table. Slowly bend your right knee, lowering the ball of your left foot back to the ground, keeping your right thigh engaged. Repeat with the left foot. This counts as one rep.
For a more advanced version, you can kick the left knee up as you step up.
Complete as many reps as you can in 40 seconds. Take a 20-second rest.