The proform gr 80 by life fitness is an outstanding amazing machine. We bought this machine when I had recevied a shot for nerv damage in my toe and had to take six weeks off from my daily run. The life fitness proform gr 80 was purchased at a resonable amount and came with a fantastic one year warranty! It is the best machine i would say overall for your knees, joints, and also your feet! I get on my proform gr 80 daily and can say I don't feel like I've lost any endurance or speed. If anything I do feel like I am working more muscles than when i do run. The different levels and settings on the life fitness proform gr 80 are sure to keep you busy! You will never get complacent with your proform gr 80 trainer, with each workout working new muscles everytime. The seat adjusts compfortably for all sizes, and has a big compfy seat. The proform gr 80 by life fitness also offers side Handel's that read your heart rate, while wearing a chest strap.