I have had total knee replacements for both knees in 2012 and 2013. I was really disappointed with the constant ache in my legs and the limited mobility. After much research, I decided to get a 49" bellicon. Within a few months my ache was gone and I can actually jog on my bellicon. The bellicon did more for me than 2 1/2 years of PT!! My back is also much stronger. Just get on it and do whatever you're in the mood for - a good health bounce, calisthenics, run, workout with weights - whatever! Combined with my Fitbit, I have lost over 25 pounds and have dropped 4 sizes! I've been especially pleased by losing that tough inner thigh area! I can't express well enough how much my bellicon has changed my life for the better. Thank you!!