Not to mention, it's a great way to build unilateral - aka single-leg - strength ... larger degree," O'Connor says. To make step-ups harder, you can hold a dumbbell or kettlebell in each hand ...

Single-leg step up: 8 reps on one side - rest 20 seconds Stand ... a little behind you and keep the weight in your front foot, hold the dumbbell at your side. Hinge at the hips and send them ...