THE PREDATOR Upper Body Ergometer from First Degree Fitness is one of my favorite pieces of cardio equipment! There are endless cardio and metabolic applications based on stance, grip, angle, etc. It's also a concentric-only device which is low-impact, easy on the joints, and easy to recover from. And though it's much more expensive than battle ropes, it has a smaller footprint, unique rotary force vectors, and a monitor with progress tracking metrics like heart rate, calories, distance, rpm, watts, etc. Get this for your home gym or ask your gym to buy this, baby!