You haven't gained 3 lbs of muscle from riding 80 miles over 10 days.
If you have not been eating more (or drinking more liquids with calories), then it's probably just a natural 3 pound fluctuation in water weight, which is common.
Stick with plain water when not riding, and keep up the good work. Losing 1 to 3 pounds a month is actually a healthy rate.
You simply have not ridden enough yet or burned enough calories to either lose fat or gain muscle. Perhaps in a few more weeks you'll notice something if you don't take in more calories to compensate.
But make sure you do take in calories and fluids when you are biking- to fuel your efforts and avoid feeling ill.
But you HAVE ridden enough already to start making a tiny difference in your health!Your respiratory/heart system is likely already making little changes, and your muscles are just waking up and blinking and saying "Hey, what the heck is going on here?"
It's a lifestyle change.






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