This question always comes to mind whenever I see people jogging along sidewalks, and wonder. Sidewalks are generally concrete or cement or something, which is definitely harder than dirt, so…

  • Cosmonaut_Collin
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    151 year ago

    What about sprinting on all fours? I think Shia Labeouf is tailing me and I’m considering finding a sidewalk if it will ruin his joints.