system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why professional cyclist like in Tour de France locks their shoes in the pedal?

When I first saw the Tour de France, I noticed that their shoes are locked in the paddle, is it something to do to make their speed fast?
gpt
It enables the rider to apply force all the way around, and not just when they are pushing down on the pedals. You use different muscles in different parts of the pedal stroke. 

Many cyclists use these pedals, not just professional cyclists.