Not sure if I should post this here or the weight loss forum but I think it's more relevant here. I'm very overweight, 300lbs at 6'2'', and I was wondering if there is a health concern to biking 12-15 miles a day, at a steady pace. I would probably use a bike machine for at least part of that so I can control my "environment" and not go down hills for most of it. It might sound ridiculous but I'm not sure if I could damage my heart doing that much? Everyone says "ease into it" but I did a 17 mile bike the other day on a local trail and I felt great, I like all or nothing.