You can strengthen your back by using a back extension machine at your nearest Dolphin Fitness Gym location.

Watch Dolphin Fitness trainer, Jon Padilla, demonstrating Seated Back Extension at Dolphin Fitness Bay Ridge PKWY, Brooklyn gym location

Jon recommends to do 3 sets 15 to 20 reps during your back workout day. Important: Jon suggests not to go to heavy, keep your back straight and do not arch your back