 This one-year study will enroll 150 men with low-normal to slightly below normal serum total T levels. Participants will be randomized into one of 6 treatment groups to receive T supplementation AndroGel of 25mgday, 50 mgday or a placebo crossed with progressive resistance training PRT exercise 3 times a week versus none. At the end of the study, participants in the exercise-control group will be offered PRT. 