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HIIT is good stuff. I believe it's the key to building a lean muscular body. Distance running is brutal on your body and there's a reason why long distance runners almost all look the same way... thin. Their bodies are cannabalized by the energy needs of running such maddeningly long distances.
I plan to get back to doing cardio, and I will definitely go back to do HIIT style training. It definitely kicks your ass. Think of HIIT in regards to sports. It would be like playing a full-court basketball game or a soccer game, where you have to run almost constantly, but you have to toss in sprint-like bursts of speed to be successful. It is extremely demanding on your system and uses unbelievable amounts of energy from your body. It also is extremely beneficial to your cardiovascular system as it forces you to work at your limits.
I usually did my HIIT on a bike as my knees just don't enjoy running too much, but I'm definitely going to have to get back to running some in order to build up the lung and heart capacity to where I want them.
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I think that's what they mean by "nickels a day can feed a child." I thought, "How could food be so cheap over there?" It's not, they just eat nickels. - (supposedly) Peter Nguyen, internet hero
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