I recently stopped working out with weights, and started taking judo. I had been running working out 3 times a week: 2 mile run in 14-15:00 or so, followed by workouts revolving around deadlift, decline bench (bad shoulder), pullups, dips, and heavy rows.
Now I'm doing 3 two hours judo classes a week. Sounds similar, but no. My physical output has increased by several times. Judo is a tough workout as it is, and for a noob like myself, it's even harder: my technique is, of course, terrible, and so I rely on strength. The black belts seem to like me as a partner, because I'm pretty strong, and a challenge. They toy with me until I tire, then **** me up. Or just go straight to the '**** me up' part, lol. I end up fully tapped, sore, bruised, and hammered after nearly every class.
Class generally starts out with a 30-40 minute 'warmup', which many times is a lot of pushups, burpees, squats, and other calesthenics. Depending on who is teaching, I may or may not be a quivering mass of jelly after just the warmup, and class hasn't even started yet. then we go on to grappling/ground-fighting for 15 minutes, and the last 45 minutes is full-force fighting/throws/whatever you want.
It's brutal. The ground hits hard, getting up over and over is hard, moving black belt judo practitioners around is REALLY hard. This is where VO2 comes in: when I take 3-4 caps of VO2 before class, I may be out of breath, but I'm not gasping. Without VO2, I'm really struggling for breath, and that interferes with my effectiveness as a fighter and student. It's tough to learn new techniques, and apply them under attack, when all you really care about is sucking in your next breath. I haven't taken C5 before judo, yet, So no comparison to be made there. I'm not sure I'll switch back, based on VO2's effectiveness so far.
I'm also in the process of applying to a local police dept. I have a physical and written test next week. I'm interested to see how I do, as I've only had 3 weeks to prepare, and though I'm in better shape and my core is stronger, I'm weaker and have not been running at all. The physical is a 1.5 mile run, pullups, pushups, and situps.
I'm relying on the Judo training, and VO2, to pull me through.