Why locking your knees could cause you to faint.
In: Biology
If you Google this you would find that locking knees does not actually cause you to pass out. What causes you to pass out is blood pooling in the lower extremities.
What does happen is that when you lock your knees, you prevent the muscles that would move, to be still and the blood does not return as normally.
If you faint while your knees are locked, you tend to have a worse injury than when the legs are not locked.
Blood pooling in the legs causes the fainting by reducing blood flow to the brain. Temperature also plays a factor.
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