Back keeps going out?

See your doctor : Some people are prone to back problems and in many cases not much to do except keep moving. There are some conditions that present with back pain that can be treatable and also some that can be more serious (particularly if you have leg weakness or loss of control of bowel/bladder see dr urgently). A doctor assessment can sort all this out

Back going out: Muscular spasm, this may indicate muscular weakness and lack of body conditioning. Other causes such as neuropathy and disc lesions has to be excluded. Continue with gradual muscle strengthening exercise for back