Stand with your feet hip-width apart and your feet parallel or toes slightly turned out.
Bend your knees and shift your hips back as if you were going to sit in a chair. Continue lowering down into a squat until your thighs are parallel to the floor.
To help you balance, you can simultaneously bend your arms at the elbow and bring them in front of the chest.
Rise back up, and from here, step your left foot backward, about two and a half feet, lowering down into a reverse lunge. Your left knee should be underneath the left hip, and should be at approximately a 90-degree angle.
With control, push through your left foot and return to standing. Repeat with the right leg.
This counts as one rep.
Complete as many reps as you can in 45 seconds followed by a 15-second rest.