It seems the more your body does a specific movement, the easier it gets. Your body remembers and adapts. Which lessens the amount of energy you used to do said task. so my question is, as a Muay Thai practicioner, why the hell am i running? I run like almost 5 miles everyday, and now that i think of it...it really hasn't helped me much in my craft. I suppose it is just tradition to run. This makes me question the validity of the term "cardio" when it comes to combat sports. i can understand how skipping rope would help me (rhythm, footwork, lightfootedness), but the mechanics in running are just so different from what i do. I just don't wanna waste any energy that could be used to directly improve my trade. Look at MMA fighters, from what i see on television, they only bother to run 3x a week, and most of the time it's sprints. so why do boxers and kickboxers do it? I don't see grapplers doing it much either. Seems like you are shortchanging yourself. any input?