We spoke about this workout technique earlier in this thread. Although it initially sounds like 2 or 3 total sets for a body part is no big deal, you have to understand that each set is super-slow, emphasizes absolute muscle exhaustion (even on the negative part of the movement) and requires a spotter(s) on all sets because you can't take yourself to that level of intensity and subsequent failure without another person or team of people around you. It's a tortuous way to work out, which is in my opinion, why he tore both his bicep and tricep later in his career, amongst other injuries.