If you hold down the Circle Button while walking around it allows you to run but depletes your Green Stamina Bar. If you let it go all the way down it goes into the Red and takes time to refill back up again, causing you to only walk and not able to run anymore during this waiting period. Instead if you release the Circle Button right at the final moment before your Green Stamina Bar completely depletes you will perform a green boost forward and your Stamina Bar will instantly refill to Green again. The limit for this is 0.6 Seconds before Stamina hits zero. Also, this works for Auto-Sprint as well, simply tap L3 [as opposed to RELEASING Circle (or A for Xbox)] a moment before the Stamina Bar is fully depleted. You can do this as many times as you want and potentially run infinitely without ever having to wait for it to refill if you learn when to release it correctly. Make sure to turn on and enable the ability to view your stamina bar in the settings for the game to use this trick.