Zynasty,
I SORT OF agree with your points here. Yes, there are specific types of exercises that can help with the conditioning Norton is looking for for grappling. And I specifically attempted to address those particular types in my post to him, anaerobic types of exercises designed to increase lactic acid threshold as well as increasing resting heart rate.
The part that I am going to slightly disagree with is this:
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They'll build the wrong type of muscle, make you less flexible and slow you down.
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This could be the oldest myth in our little world of Martial Arts. There are only two types of muscle:
Fast twitch and slow twitch (this isn't precisely true but it fits for the purpose of this argument. Galaktia will back me on this I think). The percentage of these muscles varies between people, but the average is around a 50/50 ratio. Slow twitch muscles are your aerobic muscles..the ones that are very good at operating using oxygen as the energy source. Basically, they can go for a long time before tiring but are slow.
Fast twitch muscles use anerobic mechanisms to operate and are not as efficient as slow twitch muscles. They are good for explosive burts. It's a myth that these are "stronger" than slow twitch, they aren't but they contract faster so they are useful for explosive burts requiring speed.
Muscle hypertrophy, or "body building" for the purposes of this discussion, is the idea of making your muscles bigger using strength training. The science behind this effect is complicated and too detailed for this argument, but let's just say that in general hypertrophy is happening to the fast twitch muscles. So you are theoretically increasing the size of these muscles, making them better at performing their job: explosive contraction.
Are you saying that having explosive contraction isn't useful for grappling? I would argue that point for sure.
Also, the idea that you can't have big muscles and be flexible is also a complet myth. Reference Ronnie Coleman, famous bodybuilder who could do the splits with ease. If done correctly you can be big and flexible.
As for slowing you down to have bigger muscles. Let's not forget, it was the fast twitch muscles I was increasing so how would that slow me down? Slow me down how? Have you ever seen a sprinter? They're pretty muscular.
THe problem here is that you are mixing up a bit of science with a bit of myth and coming to a conclusion that is not necessarily true. The reason why many big, muscular guys are slow, inflexible and have terrible cardio isn't because you can't be both.
It's because it's HARD to be both. In order to perform muscle hypertrophy, you have to really dedicate your workouts and diet to the task. You have to increase your mass and dedicate your caloric intake towards the job of feeding the anabolic process. This is almost the exact opposite of what you have to do in order to improve your cardiovascular capabilities. So guys who are looking to get big in the gym aren't going to be doing cardio workouts usually. Inversely, a marathon runner isn't going to increase his mass because having more mass is harder for his heart to supply oxygen to his muscles.
I can tell you that pro level fighters, and world champion level Judokas and BJJ practicioners are training in ways that are efficient at performing multiple tasks with the workout, and if you want to get that type of workout out of what you're doing then you are going to need to train like they do.