The general rule of thumb with step-ups is height before load: determine the appropriate step height first, then choose a load that allows you to perform the desired number of reps with good form. With the side step-up in particular, the maximum height is determined by how far forward you can move the working knee—or…
Start with a low step beside you and use only your bodyweight at first. As your strength and stability improve, you can progress to holding a pair of dumbbells. Keep your hips level throughout the movement. If the step is too high, maintaining this position will be difficult. A common mistake is pushing off with…