Heres what I did:
Lotsa work in the woods, climbing dem trees n stuff. Works out those legs and arms.
Constant bike riding, like 50 miles a week with huge ass hills. Make you sore but damn dem calfs
Eat better! More home-cooked meals, don't touch fast food!
Do random pull ups and cruches. And do both at the same time, it'll hurt like a bitch but damn it'll give results. I had a workout routine that involved having to do 2 pullups before advancing down the stairs, or into the kitchen.
Do it man, do it!