Could this be a Bicep strain?!

I was discharged from the Army about 6 months ago due to a back injury I had in Iraq!. During my time home, I wasn't very active so I put some weight back on!. Recently, I was told by my doctor that my back was fully healed so I joined a join to try and slim down a little bit!. I didn't work out alone, I had a personal trainer and I didn't even lift weights, just did some work outs with the gym equipment!. But yesterday, I woke up and couldn't straighten out my arms!. If I try to force it, there is extreme discomfort and a lot of soreness around the bicep area!. It's not the kind of soreness that a person usually gets the day after a workout!. What could I possibly have done to my arms!?Www@Answer-Health@Com

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