I started biking regularly about 6 weeks ago, and have been doing an average of 15-20miles a day. I was really out of shape physically before this, although I have a BMI of 21. I find that my quadriceps and hamstrings and biceps have really shaped up, but other parts of my body are still pretty flabby.
Could someone suggest excercises that help develope the other muscles as well?
Also, after longer rides (with more uphill climbs), my lower back hurts a lot. Is this normal muscle building pain? or am I doing something wrong?