Honestly, going to gym/running has been the best stress relief... In year 12 I've started running much more and I've maintained gym, and honestly without it I think I'd have done much, much worse.
I did stop playing Basketball for the year, and I haven't had as much chance to do what I've done in other years (biking, swimming etc), and tbh I sorta regret it - sorta don't. If I could choose again, I probably wouldn't, but so long as you stay physically active you'll do better imo.