Distance running is not ideal for building a lean, muscular physique. But interval runs can be a good change of pace that won't burn up muscle tissue like steady-state cardio. The following schemes, performed for 20 minutes, are simple and effective: Bodybuilding.com

Distance running is not ideal for building a lean, muscular physique. But interval runs can be a good change of pace that won't burn up muscle tissue like steady-state cardio. The following schemes, performed for 20 minutes, are simple and effective: Bodybuilding.com

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