Why does your back hurt after working out?

The lower back muscles can become enflamed after a workout due to the amount of stress often placed on the lower back during weight exercises and even Cardio. Another cause that can lead to Back pain especially in the lower sections of the spine can result due to toxins being excreted by the colon during a detoxification. I would recommend speaking with a qualified doctor to determine if the pain you are experiencing is stress related or diet related. Pain in a sign that something is wrong with the body and should not be masked by pain killers and ignored especially if pain and discomfort continue.