I am 59 years old and have not lit on any type of exercise that I really enjoyed. I have not had for very long yet, but I can already tell that this time it is going to be different. I can jump on my bellicon and though my calves may get a little sore while I'm working, but the pain is not lasting. On my treadmill, my feet would hurt, and so would my calves and shins. Not with my bellicon. I did get the 44 inch as everyone talked about the larger being better. I do like it, but I also know the smaller would have been okay also, as I am not that tall. I have used the dvd, as I wanted to get the proper posture down. I will check back in after I have had it longer, but so far so good, I am very happy with my purchase!