I am about 310 and started the spring at 346. Trying to lose weight monitored by weight loss doctor and ride my bike. I rode 150 miles in June, which I think is great considering my first ride was May 20th at 1.8 miles. My longest is 14 miles but could have gone longer by my wifes bike's breaks got messed up. I have a Gary Fisher Napa bike. My question is what a normal amount of riding? I am am doing about 10 miles or less typically over my 19 rides in june. I average about 9.5 mph. I have no idea if i am doing well or should be doing more. Seems like 10 mph is hard for me to do, but I guess it is actually slow? Thoughts?