This video brings me back to seeing dudes at the powerlifting gym I used to go to in college, they would smoke either crack or meth (not sure, not really an expert on the smell, but the glass pipe was a dead giveaway) before hitting the weights. They sweated a lot, looked like they were about to have a heart attack and they fucking destroyed the iron. There is, however, another substance that many smoke, especially here in Denver and many claim  that a little toke helps them get through a hard session in the gym.