Oh wow, I never thought I'd see a JayBlade video to be discussed in a MMA forum. (New here so I don't know much about what you guys discuss)
I myself only started working out intensively 3 years ago, so I am not that experienced but I feel that doing insane reps helps a lot. After I got the basics down and my body was ready to not be broken down from intense training I had started doing moderate amount of basic calisthenics like pushups, situps, lunges, squats, etc. while also doing some cardio like road cycling and running. I kept on doing that for a year with some breaks in between and I saw great improvement and I increased my stamina and gained some muscle mass. At the time I was ecstatic, I had never done this before and it felt like I was in a new body, but I soon learned that I had not improved as much as I thought. Afterwards I added more calisthenics and I also added in weights to get a good balance between the both and also I increased my usual number of reps which was 30-40 to 100-120 (not for the weights, the weight reps were still moderate). This was the change that I needed, It hurt like hell and I couldn't move at all for the first few weeks, but afterwards I really did change. I had put on loads of muscle mass on my legs and arms and my core was stronger than ever, while my muscular endurance was on a different league than before. Of course now I am always increasing the number of reps the moment I feel comfortable so I never stop growing, while also giving my body rest after multiple sessions.
Well, what I was trying to say was that calisthenics give the greatest benefit when in high reps in from my experience.
Also sorry for the large paragraph, I'm the type of guy that doesn't stop talking :/