The patented bungee system has many single bungee rings that can be easily exchanged if they are worn or tired. It only takes a few minutes to replace your bungees and no tools are required. The advantage is that the equipment can be adjusted to the maximum weight of the user and the intensity of training. All workouts and exercises can be performed using any bungee strength. In general, softer bungees provide more efficient, but also more challenging, workouts than firmer bungees when used with normal or high-energy/faster-paced workouts. Firmer bungees don’t last longer than softer bungees. Bungees tend to last from 1-2 years with normal, daily use.