I just about passed out working out today. Kirk, Dan and I worked legs today - and didn't do it in a real typical way. One guy had a large rubber band hooked to him via a harness, and the other end was hooked to the guy behind you. We'd then run 40 yard sprints with the other person acting as an anchor behind you. We did 6 sets of 40 yard sprints in each direction - first 6 forward - and then 6 running backwards. I was hating it while doing it, but felt great afterwards. After the first set of sprints, I started hyperventilating and got dizzy. Dan found out the hard way not to eat cinnamon toast crunch right before working out. Kirk a great trainer - and knows just how far he can push you, and how to get the most out of you. There's enough trash talking going on at the same time to keep everyone competitive, but there's a fair amount of grace cut as long as you're working to the best of your ability.