I gained a lot of weight over twenty five yrs. Starting in my late 30s at 250 lbs .by 62 I was 585 lbs and near death. I made a drastic change in diet when told I was going to be a grandpa. By 64 I was under 300 lbs and decided to pick up a bike to help w/ exercise . I bought a trek marlin 5. For next yr I used it dropping down to 215 lbs . At 65 I started collecting road bikes and using them to build strength. Today I own a dozen vintage 70s steel frame bikes. At 66 and down to 175 lbs ,I ride a different bike each day. I try to ride 20 miles a day . Biking and walking everyday has helped me greatly.i lost a total of 410 lbs ,put my diabetes into remission ,and gave myself a satisfying hobby to fill my time.