As easily done as said...
Yesterday got to play a couple of doubles sets with local winning 12's and 14's girls. Both adult sized, but only 3 total years of tennis experience each.
I easily allowed their winners to go by, without even moving for the ball. No biggee, I could hit the NEXT ball where they didn't like it, so saving some energy can work.
About 27 years ago, one of my monthly practice partners NEVER ran for a ball. She was a woman's A/Open, and 3 months after we stopped hitting, she WON the CanadianOpen. I doubt she decided to run just for that tourney.
Sometimes, you gotta employ the strategy that works best for YOU.