Intensity Factor
Sprinting will build bigger leg muscles than slow jogging becasue of the much higher intensity. But unless you are a genetic standout, I don't think it will do a heck of a lot in regards to building upper body muscles. The old time bodybuilding trainer Vince Gironda claimed that running shrunk most people's arms. In hardgainers and people with fast metabolisms, I think it true.
Sprinting will build bigger leg muscles than slow jogging becasue of the much higher intensity. But unless you are a genetic standout, I don't think it will do a heck of a lot in regards to building upper body muscles. The old time bodybuilding trainer Vince Gironda claimed that running shrunk most people's arms. In hardgainers and people with fast metabolisms, I think it true.
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