Bodyweight Step-up to Reverse Lunge

Use a stepper or a box about knee level high 

Take a shoulder width stance with toes pointing forward

Keep your fist clenched at chest level, keep your chest up and breathe in

Step up with your right leg and squeeze your glutes as you finish the rep on top

Step down to starting position and do a reverse lunge with your right leg while keeping the left leg firmly rooted on the floor

Come back to the starting position

Finish a set on the right leg and then repeat the same on left leg