I've been playing bass for about 3 years, but only as a hobby. I've never had a teacher either. Usually I play for around 1 hour a day, sometimes up to 3 hours, but now I've got a gig coming up, so I met up with my band and practice for a whole day, two days in a row.
I didn't have any problem during the practice itself, but a few days after the practice they just hurt (after waking up, playing badminton which usually doesn't hurt either).
This has happened to me twice now. What should I do? How can I figure out if I have bad posture? Thank you.
Ps. Both my wrists hurt, but not necessarily at the same time.