POD, a scout recommended it in August, suggested start after his fall season ended. We saw in the mid-game/between innings interviews during the Arizona Fall League games that many AZL players said they were starting yoga after their fall seasons.
Son started yoga with a trainer about a month ago. He says it is a lot harder than it looks. As others say above there are position specific things to do & probably to avoid. Would guess it will be a regular part of college baseball.
Best of luck to your son.
Enjoy your Thanksgiving.