I'm 6'2", and it took me about 1 year to lose the first 40 lbs (through diet and exercise, including bike riding, swimming, aerobic machines, etc.). The second 40 lbs (and actually a bit more...) I lost during one hot summer that I spent doing roofing for a living. Yeah, I also exercised and I started riding my bike a lot that year, but I'm sure that broiling myself on hot roofs was directly responsible for at least 25 lbs. of that...
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Je vais à vélo, donc je suis!