Best Machine for toning tummy and working out upper body Instead of focusing primarily on lower body power and endurance, it targets the upper body even more so than rowers—and definitely to a greater degree than any cardio machine with convenient, ergonomic handles that move in tandem with pedals and footbeds. What’s more, unlike rowers, bikes, or any other machine that doesn’t require you to run, you’re able to exercise in an upright standing position, making it a top pick for some trainers