I am going to be 41 yrs old in Dec. I weigh the same as I did when I left the 7th cav 20 yrs ago and could pass the Army's PT test any day of the week, the secret is to listen to your body. I have what I call my fitness run that I try to do 3 times a week, it is about 4 miles on semi-level route. Weather permitting I like to ride my mountain bike to my running route and time permitting use the bike for a little extra cardio after the run. As far as strenth training I lift free weights every other day if I can, targeting chest and shoulders. Cross training is important to me and I try to mix-in some basketball or tennis, the thing to remember is that these things count as a work-out and should be treated as one, get enough rest. Eating is the toughest part to keep in check, its too easy to eat "garbage" at the fast food joints, it's a by-product of modern life. Grazing during the day works for me probably because my metabolism is starting to slow a bit. Try to listen to your body, if you're sore...you're sore, let yourself heal, if you're hungry use common sense and grab something that is'nt going to glue to the waist line. "Being slender must run in the family"...if they only knew.