Sprint Reloading is the act of reloading during a sprint.
Original Author: Pimgd
When: During reloads.
What: Sprinting and reloading at the same time.
Why: During reloading, you are vulnerable. A common basic tactic is to get back in to cover when you are reloading. The quicker you get in cover, the better.
How: First hit the reload key, and then sprint. It's as simple as that - you just need to be aware that the option exists.
Bonus: You can jump too.
How to practice: Just try it alone on a server. Try to make a habit out of it aswell.