I'm 58, out of shape and overweight. Walking isn't cutting it. EVEN power walking. I feel this in EVERY muscle. I hate it because it's work, I love it because it works. Just the first week and I see changes. I HATE the jumping jacks, but I do them and if I can't hack it, I at least march in place or do butt kicks. I keep moving and try to stick to the program. I've taken pictures and I am DETERMINED to get my butt in shape and looking good again. Easy DOESN'T do it.