I'd have to say Arnold Schwarzenegger's most well known feature when he competed in the world of bodybuilding was his huge biceps. His arms were just humongous, this picture you see of him over to the left shows off his massive arms. I'm amazed how big Arnold Schwarzenegger got.

They say Arnold's arms measured in at 23 inches in his prime, is that huge or what. Some of Arnold Schwarzenegger's favorite exercises for building up his bicep muscles were the preacher curl and standing barbell curls. Compound exercises with heavy weights were great for building up his bicep muscles too.