system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why don’t the bottom of your feet get bruised from walking/running?

That much pressure/impact anywhere else on your body would leave bruises. Especially larger people?
gpt
Because they've evolved to be the bit of the body that gets walked on the whole time so there's thicker skin, fewer blood vessels etc. and a heavier heel and the ball of the foot to help protect it and take the weight. We evolved the foot arch to better support weight and distribute it as well as a strong big toe.  

Chimps etc. that do a lot less walking have gripping toes and flat feet, ours have evolved almost entirely to support weight when walking/running.