I used to run a lot, then found out I was a Type 1 Diabetic (insulin required, you can't prevent it). Excersize was hard trying to balance my blood sugar levels. So I quit. That was 3 years ago. I gained about 100lbs over the last 3 years. I now weigh about 250, but was up around 300 at one point. I've been itching to fix that for some time, and about a month ago I decided to buy a bike. I have an old Murray, it sucks, so I bought a Trek SU100. I love it, and it's a good place to start. I've been riding about 10 miles a day or more for the last 2 weeks or so and it's the most fun I've ever had working out. Looking to hit that 200 mark again. I'll keep you posted!