If you feel pain during weight training, what should u do?

You should stop and stretch or walk around, just cool off and loosen your muscles. If you are lifting weights and you feel pain, then maybe the weight is to heavy.

Sometimes when I work out I am not doing something right and my back begins to hurt , try to modify your body position, it will spread the stress in your joints and muscles out  in a more confterable  way . make sure to rest at least a minute or three between rounds . hope I helped some :)