If the goal is to help swimmers go fast, they should not be...

It sounds good in theory, but there’s one small problem.
The best swimmers don’t do it.
Watch carefully.
You can see how the elbow exits the water before it’s straightened.
More importantly, watch his hand.
The goal is to create propulsion for as long as possible without negatively impacting the recovery.
Even in the shortest of events in the highest pressure meets, swimmers are letting go of the water ‘early’.
It’s a critical skill for fast swimming.
They’re simple, they’re practical, and they’re effective.