At your age, a testosterone boost isn't something you need.
Just do the right kind of lifting routine, keep the aerobics to a minimum (but do them for sure to keep your metabolism up so your body doesn't feel inclined to store foods as fat), feed your muscles and body correctly to keep the fat off and the muscle repair from the workouts going and you'll see results.
Good luck.
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Cheers,
Tony
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'07, e92 335i, Sparkling Graphite, Coral Leather, Aluminum, 6-speed
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