Stand in front of a stable bench or box holding a dumbbell in each hand at your sides. Keep your chest up, shoulders back, and core engaged. Place one foot fully on the bench so your whole foot is stable. Drive through the heel of the elevated leg to lift your body upward, bringing the other foot up to meet it on the box. Stand tall at the top with hips fully extended. Then step down in a controlled manner, leading with the same or alternating leg depending on your preference. Repeat for the desired number of reps while keeping movement smooth and controlled.
Log your dumbbell step up sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.