The Wall Trainer uses a slightly less amount of resistance than what you typically see on traditional weight stack machines. Designed and engineered with the equivalent of a 45 lb dumbbell in each hand, you will never need more resistance. Today's workouts are about form, function, balance, and being fit, strong, and healthy. That said, too much resistance is counterproductive to being healthy. Lifting too heavy, especially as you get older, can leave wear and tear on your joints or lead to injury. The Wall Trainer cord system is a safe, intense exercise machine that increases resistance to the point where it’s impossible to cheat. We recommend focusing less on the number and more on how it feels and the results you are getting.