You're kind of contradicting yourself here.
He used them to enhance his PERFORMANCE. Not to look like Arnie.
How he looks (within reason obviously) has a minor impact on how he performs..especially in cycling.
My brothers girlfriend brother (sounds long but really isn't lol) holds a few world records for cycling and raced the tour down under this year and he doesn't look like he would be fast as shit on a bike, but he is. Doesn't have huge legs, kind of lean, small arms, just looks like an average guy that is in decent shape.
I think Oni said he was a sprint cyclist, they normally have huge legs. Real ones though not imaginary.