You can adjust the resistance from 55lbs to 154lbs. Any man can close the first step, but not all can close the last step. If you are a professional athlete or just a normal man or even you are strong women with little bit, it doesn't matter. Because you can adjust the resistance of the clamp for your own strength! You can do your custom exercise according to your own strength with only 70 GD. No noise or breakdown using high-strength molding springs, thermoplastic nylon and steel. Lightweight, portable and noiseless, you can exercise anywhere. You can work with pro 70 handle where gj you can take your home, office, car, fitness club, library, etc. GD 70 Pro-Adhesion is protected by a government issued patent us (patent not us). 6881177 B2).