I know it's been discussed on the forum before, but I would like to bring it to the new people's attention.
Recently I started including 1-2 mile runs in my training routine. I am now able to go through my workout with less energy loss between exercises (I feel much less tired by the end of my 1.5hr workout) and hence am able to output higher quality repetitions and therefore entice greater strength gains.
Hopefully most people are including some form of basic running in their programs.
Further reading (recommended - scroll down to Coach Sommer's post):
https://www.gymnasticbodies.com/forum/topic/5063-cardio/