I struggle with this to have you ever tried physical exercises like walking running biking swimming

Get creative. Learn a new art. Make videos. This usually works for me.

Talking about it with other people who understand can be a big help. Have you tried any online self in help groups? There's tons of support out there. I use heypeers.com (some free meetings, some low cost) and https://supportgroupscentral.com/ (all free, you have to sign up in advance). DBSA meetings are my favorite and lot's of people with borderline and bipolar attend.

Well, when I get manic, I try to channel it into housework. Sure, I may rearrange the living room three times in one weekend, but I've spent no money beyond the cleaning supplies. Just... one problem I had that came with this, you may want to be aware. I'd forget to eat and then later when I realized it, I'd be in the middle of a specific task, so I'd tell myself that I'll go eat when I finish it but before I start the next part... but then I'd forget. This cycle would repeat and ultimately I'd spend 2-3 days with very little to eat. So I recommend setting meal alarms and just temporarily abandoning your task when they go off so you can immediately go eat instead of forgetting.

For me, I read a book.