How does rolling in parkour videos help them feel no pain at all? How does it not break their knee or ankle?
In: Physics
You’re transferring vertical velocity into horizontal velocity instead of stopping on landing, which would require the body to absorb the force. You’re at the top of a tall ladder, you jump, you land hard. Put a slide near the bottom of the drop (that looks like a quarter of a circle, but best is parabolic) and you’ll get a little bump as you hit the nearly vertical part of the slide, and you’ll shoot out horizontally unharmed.
Notice they’re running high speed after the land and roll, as they translated the vertical velocity into horizontal. Of course, get that landing just a little off, hit a knee instead of rolling, and you do have broken bones.
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