I agree with BTB it is important to take note of the amount of volume you do for legs on each day. If you know you are lifting legs frequently throughout the week there is really no need to make each time a PR setting day or all out warfare.
For me, I train legs quite frequently. I'll either do some light squats, walking lunges, leg curls, GHRs, leg extensions, and others during my warm-ups even on upper body days.
It's just another way to approach increasing your recovery I came across from Louie Simmons. The main focus is just to get some sort of work on the legs and blood flow to them. Sled work is also great because it's eccentric less and can actually increase your capacity of recovery.