Yes, it could be diet, and it could also be training. If your running for some sort of athletic improvement, ofcourse you should run what fits your goal. Soccer players work on over all conditioning and sprints for fast paced games, cross country obviously endurance and distance. But, you should also vary your training. You'll make the most gains in your aerobic capacity by performing 'easy' or 'long runs' and a sub maximal pace for an extended period of time. With this, the training increases the time you run, not the intensity. Incorporate that, some tempo runs (specic paces with breaks), interval training (shorter/intenser intervals), and you should be golden...
And yes, make sure your eating enough to maintain or gain, and not lose muscle/ diminish athletic returns. best of luck.
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