Your body is closest to a Mesomorph. You have a naturally fit body but to maintain it or improve it you should exercise and diet correctly for your type. Strength training can be done more often and for longer sessions then would be good for an Ectomorph, but you must still be carefull not to overdo it. You should train with moderate to heavy weighs and at a moderate pace, not resting too long between sets. You will find you gain muscle quite easy (some women and even men might not want to get too bulky, but this won't happen suddenly. When you are happy with your muscle size simply train to maintain it). Stick to a good healthy diet to keep you lean and muscular, and watch for any slow creeping fat gains. Engage in and enjoy aerobic activities, sports, etc. but do not overdo.
