Take possession of suitable weight dumbbells and position yourself in front of a sideways flat bench. You are standing upright with arms hanging at your sides and palms face inward. Ensure you are close enough to the bench so that you remained balance when you lunge forward and step up. Core is tight, feet are flat on the floor. This is your starting position.
Keeping your core tight and your torso as straight and upright as possible, exhale and step your right leg up onto the bench. Drive up through the heel of the right foot to bring your left foot up to meet it on the bench. The finish position of the step up has both feet on the bench at shoulder-width, dumbbells hanging down at sides.
In the reverse phase, inhale and step down with the left leg first. Once it lands on the floor, step down with the right leg to return to the starting position.
You may elect to focus on one side to a set before changing or alternate repetitions one side then the other.