The trouble is, it is so hard to unpick what works and what doesn't. As lifters, we rarely change one thing at a time to evaluate its effect. And even if we do, you still can't say for certain that a beneficial effect is the result of doing X, because you've got no control group to compare it to. Maybe you would improved without doing X as your body was going through one of its mysterious natural gaining cycles.
Anyway, my own feeling is that the following contribute almost nothing:
foam rolling (feels painful, so it must be doing something...well, not necessarily)
stretching (feels good, so it must be doing something...ditto)
fascial stretching (very little evidence that it's even possible)
aggressive sports massage (just bruises and damages tissue, IMO)
hot baths for recovery
cooldowns after aerobics (maybe I don't understand the science behind it, but it doesn't make any sort of sense to me)
chiropractic manipulations for lifters
box squats for unequipped lifters (no carryover for me)
I could go on...
230 strict press @ 220; bodyweight+187 X 4 dips @ 180; 403 front squat @ 210; 10 000 push-ups.
Ignoring irrelevant credentials since I was 17.