I'm 22 years old (23 in December), male, my height is 5ft 7in and I weigh exactly 10 stone. My bicep measurement (when tensed) is 12.5in on my left arm, and 12in on my right arm.
Judging by my height and weight, is that a reasonable size for biceps?
What would be the best exercises to do to build my biceps, triceps and forearms?
I've got dumbbells ranging from 1 - 4.5kg in size, and I occasionally do various curls using them. How many should I do and how often should I do them?
I consider myself to be in good health and am fairly strong. I also do a moderate amount of cycling (normally about 8 miles per day, 5 times a week) and I have a good, balanced diet.