Some people are good at long-distance race, some people are good at sprinting, and human structures

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about long-distance running a good cardiopulmonary function of the muscles where red muscle (slow-twitch) fibers more than aerobic capacity with strong

sprint Tendons are Changbai muscle (fast-twitch) fibers more than fast muscle contraction more powerful explosive was born

long-distance running can be acquired to meet the shortfall, but for those born with heart and lung function or muscle type counterparts, a gap.

Of course, on, be good at long-distance running hearts and minds of lung function is good, body lean, less fat, while those who are good at explosive sprint strong in nerves.

No, the key is acquired efforts