I got a video of Magnus Samuelsson of World's Strongest Man fame. He said in his training routine that you should not train biceps and triceps of the arm in the same session, and he said don't ask him why; just that he knows it does not work.

Can you guys think of reasons for this? I usually dont train this way anyway, cause I tend to have push and pull days in my training. I seem to notice better pumping when only training one or the other and not both tho.

Any thoughts?