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Appears to be an overuse injury. Scottie and I put in about 5 hours on the trails at my place a few weeks ago. I fell a few times that day but never where I thought I got hurt. I woke up the next day with my wrist in a lot of pain so I just took it easy and it got a bit better. Went riding 2 weekends later and it started hurting in a few minutes and wasn't ridable in less than an hour.
I think that when Scottie and I were riding I tweaked it, probably a few times, after I got tired. I rode through arm pump to the point of exhaustion and then rode some more. We were mostly doing technical stuff breaking in the new rock garden trail.