So now that I'm a couple years past 40 I feel like I'm losing some body mass and strength. Not a lot but I was never very big to begin with. I've always done some weight training but mostly just keeping active kind of stuff. I'd like to gain back a little muscle and then maintain it. Can anyone recomend a good work out program? Also I've always been a high activity guy. I know it's hard to gain weight when you're burning a lot of calories but how much activity can you do and still gain weight? I've heard things like more than an hour a day is too much yet There are people who do high activity jobs 8-10 hours a day then go to the gym and still bulk up. Pro athletes play their sport and bulk up at the same time. This is the most confusing area to me. Lastly I have a lasting elbow injury that keeps me from doing curls and many back excersises but for some reason I can do chin ups no problem. Any recomendations for other excersises to work those muscles that aren't too stressful on the elbow?