I had to stop lifting weights because of a shoulder, and I never liked running so I bought a bike. I got 8 or 9 miles in this am but now it's mid 80's sunny and 100% humid. I put 1500 miles on my bike two summers ago and never left the city, love riding. My bike is a wallyworld 29 inch mountain bike, nothing special, just fun to ride. I put a thingamajig on it that tell my speed and mileage.