If you want low-impact exercise but want to really get your heart rate up to vigorous intensity, you can do it with a TreadClimber. Just Walk and get a better workout in half the time. The TreadClimber machine gives you an intense cardio walking workout that's easy on your joints and burns up to 2.5X the calories of a treadmill at the same speed! Extra set of treads and all manuals included. New valued at over $2500. Selling price is $750.00 or best offer. Works great and has been used very little.