Anyway, you stand on it and glide your legs back and forth and it is similar to cross country skiing. Your feet never leave the pedals, so it doesn't put shock/stress on the joints, other than stretching your legs out while they swing. I bought my more basic model at WalMart for $100. They have fancier, heavier ones on TV. It is completely manual, so you get out of it what you put in. The stronger you pump, the more workout you get.Good luck with the referral!

