The two best exercises of all time to train the upper body. Chin-ups work the back and biceps while dips work the chest, shoulders and triceps. Both of these exercises are so productive but unfortunately most people can't perform more than even a few reps while using their own body weight.
Years ago there were a few companies that developed an assist system using a weight stack for commercial gym market that basically worked in reverse. The more resistance you add the easier the exercise. Great machines but the cost was in the thousands.
Now Powertec has developed the first assist ststem in leverage form at an affordable price for everyone. The concept is simple. Load weight onto the lever arm and that is the exact amount you will deduct from your body weight so you can perform chin-ups and dips using full range of motion and ease.
Oh yea, since we released this unit two years ago we discovered you can also perform an awesome hanging crunch with assist! Now you can also firm up the abs to complete the perfect torso.