When I gained the initial 30 pounds on T, I think a lot of it was muscle; a lot was also the fact that I was eating more to keep up with my changing metabolism. When I started losing weight, I was doing a landscaping job, so I was on my feet a lot, but apart from that, I just added vegetables and fruit into my diet, and tried to make it more balanced. Really, any exercise you do on T (or so I've learned) will make at least twice the difference it did before T in terms of losing weight.
SD