I have been lifting consistently now for nearly a year with a personal trainer. I have noticed a great improvement in my body and in the thickness of my arms.
I do not notice any peak in my bicep and wondered what I can do to get more definition,so, when I got to flex my bi's I see some results.
Any advice, be it eating, or specific arm exercise advice is greatly appreciated. Also, does the amount of weight I use matter?
Unfortunately peak on a bicep is genetically determined, getting the excess bodyfat off will help show the natural contour of the Bi - this is a common problem even the former Mr Olympia had it ( Dorian Yates)
Biceps are a very small muscle - I would train them once per week with 5-6 sets. While there is very little you can do to change the genetic shape of the bi you can do movements that put the wrist in maximal suppination adding to the greatest recruitment of fibers. (dumbel curls bringing turning the pinky towards the thumb) Biceps also have a high concentration of fast twitch fibers and respond well to heavy weight try some weeks of heavy weight by 5 reps.