I was at work and was helping move a heavy piece of equipment. I lost my balance and pulled my left arm. I played a gig over the weekend and had very sharp bicep pain all night long. I took a couple of days off, and had no more pain. I practiced tonight, bicep pain came right back. Off to the doctor tomorrow, I hope it is nothing to serious. I also have gigs every weekend this month. If I have to cancel them, that will be a real bummer.