Offering 10 great exercises in a single easy-to-use machine, the best-selling Gazelle Freestyle burns calories, tones your muscles, and improves your cardiovascular endurance. The Freestyle is perfect for all fitness levels, with an unsurpassed range of motion that lets you go from a slow walk to a full run with no sudden stops, so you won't put undue pressure on your joints. The resulting aerobic workout will thus challenge you without sacrificing your knees.