The Cross Trainer is perfect for those looking to improve their fitness. During the workout you will experience a mild resistance only, making it easy on knees and joints while still providing an optimal exercise for people to improve their fitness. The Free Runner trains your lower body with an even muscle resistance of no impact. By simulating a running experience familiar to most, the Free Runner does not require prior learning. Instead you can immediately step up and start running at an intensity of your own personal preference. This product, with multiple activities, is designed to allow different people to exercise at the same time. It is for anyone aged 13 or above and it's ideal for seniors.