wrist size

[AJAX19]

I find this funny that you call it a problem, for most a thin bone structure is a blessing. The smaller your bones the bigger your muscles appear. Take a look at Flex Wheeler I remember reading a MuscleMag that described him as having bird joints. Your real problem is your very ectomophic concentrate on low reps and heavy weights this will create muscular hypertrophy "widening of the muscles". To answer your original question you can't enhance bone structure but through power lifting you can give the appearance that you did.

 

[DaMan]

If you're in Bodybuilding that would be considered good genetics. The smaller the joints the bigger the muscles look. Creates an appearance of bigger muscle bellies. I also have small joints, which only causes problem when doing heavy weights.

What he said. My wrists are TINY, but at 6'2" and (formerly) 180lbs I looked like I was 210... definitely think it has to do with a bone structure.

DOWNSIDE - my ankles sprain pretty easily.

 

[Gorlim]

measured my wrists there just over 6 inches and im still growing .. thats damn small for 6'1.