Wrestler's bridge, front & back. Can get what is know as a bull neck, which can set you apart from most regular BB'ers. Gives a look of strength and a athletic impression. After a while hold a BB/DB over you and bridge with that extra weght. A 100lbs is not out of the question, and can be rather light in no time. Bridge on a folded over beach towel, easier on the head. Also work the traps extra hard because the neck usually grows rather fast on most guy's. And you want that balanced look of the neck & traps together. A lot of very large BB'ers have pencil necks, too bad. Good Luck.
SIDE BAR: The old classic balance of a BB'er is to have the neck, arms & calfs pretty much the same measurement. So if one has a 18" arm than that should apply to the neck & the calves. I wear a 22 1/2 " collar but my calves are about 3 inches less. The arms are just a little more than my calf measurement. I would think getting those ideal measurements with anything above a 19" neck might be a chore for most guy's. A 18" neck, arm & calf would probably be more possible for most guy's.