Grip one kettlebell dumbbell firmly in your left hand with your arm extended by your side whilst holding another directly overhead in your right hand. Stand facing the bench. Bring your right knee up and step up onto the bench. Brace your core and keep your chest up as you drive all your weight through your right leg to stand up onto the bench. All the while exhaling as you do so. Pause at top when it's fully extended. Slowly return to the start position by bending at the right knee and driving the hips back, inhaling as you do so. Repeat all the required reps (or time) on one side before changing to the other. Be sure to change the positioning of the kettlebells over as well.