Loomis didn't give his waist size or body fat percentage so no one here knows if their dealing with the Philsberry DoughBoy or what. Not that he may be misleading, but a true, cold, measured first thing in the morning with a steel tape 19.5 arm is very rare. Even a true 18 1/2" arm is not that common. And as XL said, that's pretty much a beginners question because by now Loomis should understand how his body reacts and grows from different systems: sets, reps, times a week, etc. There are dozens of succesfull arm building programs out there, really too long to list here. Example: 1 1/2's, 21's, tri sets, giant sets, partials, running the rack, SS's, rest-pause, all day program-every hour, force reps, negatives, etc, etc, etc. Good Luck in your search.