Calum chose these exercises because he knows they provide the best pump and will hit your biceps and triceps from every angle. If you can get through these arms exercises without ripping your shirt, you probably left too many reps in the tank!
Once you're done with your arms carnage, hit the deck for some abs training. Don't you dare try to cut the circuits short or skip any of the reps. Thick abs are built just like any other muscle—with heavy reps!