Today I trained back, and at the end I trained biceps and forearms, after workout and until now (5 hour later) if I bend my arm with fist facing forward (same as forward curls position), bicep and upper forearm muscle get stuck, it feels so weird I was worried the first time, I would have to force my arm down, and then there's a muscle spasm and the muscles get unstuck, happens every time I flex my arm, in both arms.