CS4 Cardio Strider - Featuring a Swivel Seat with Motorized Seat Height Adjustments The unique linear path of the CS4 pedals greatly reduce knee stress while still engaging the user's leg muscles and glutes. The moving handlebars target the large muscles of the upper body for maximum calorie burn and conditioning. Twelve preset programs with 20 levels of resistance make the CS4 the perfect, full body workout for people of all fitness levels. Attain your fitness goals without compromising your joints. Being fit never felt so good!