Running

[stoofur]

Why is it when humans run we have to pump our arms? It seems also there is a corrolation with the speed our arms move to the speed our legs move.

[Panic Button]

Balance, and to keep the torso straight.

[4getmenot]

And you do go faster

[novalis]

Newton's Third Law of Motion-- To every action there is an equal and opposite reaction. Left leg forward. right arm back and vice versa.

[4GS]

If you didn't pump your arms, you would fall over

[redcrx]

and this is what happens if you dont move your arms fast enough.

https://www.youtube.com/watch?v=IrP9anxy0pY

[stoofur]

Thanks for that guys. But my work colleague just demonstrated in the office that you can run without falling over. (Yes the boss is out of the office today!) I must admit he did look stupid (my colleague not my boss).

[4getmenot]

well thats it then you look stupid if you dont :-)