I'm pretty overweight, like 85 pounds overweight, and I've been where you are. The main thing I'd say is SLOW DOWN. You probably rode those 2.5 miles at your old pace. You can't ride at your old pace anymore. You will need to work up to that. As you ride, you can build up to that old pace.
When I started riding, I started at about 8mph. That's really slow. Now I can average about 12mph over 35 miles. You just need to work up to it. Start with a slow pace and go out for 30 minutes. Keep your heart rate where it is elevated, but not racing. Do 30 minutes 3x for a week, then increase to 35 minutes for a week. Start throwing in longer rides on weekends. After awhile you will be going much faster and much longer. It just takes time.



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I also found an article in my Weight Watcher's magazine, which unfortunately i can't find on line, that gives a schedule for training for a 35 mile ride. Basically ride 4 times a week, starting around 30 minutes, and build up a little every week. if i can find the link i will post. Good luck!



