I never did the diet, but I went through the 90 days, twice. I'd never done videos before because I thought they were , but now I think Tony Horton is the man. For being an ex-athlete, that stuff was way harder than I thought it'd be. Now I do one or two tapes a week between my cardio routine. My best 10k is 45:38 right now, which for a guy >200lbs I think is doing well. Plyometrics can bite my ass (it's the hardest tape in the series as far as I'm concerned).