How do I tell the difference between an ache or pain and an injury?
If you get pain or stiffness that you start to feel earlier and earlier in your exercise sessions or that lasts for a long time afterwards, you may have an injury. This could mean you have to change your activity or seek professional advice. These symptoms are different from the muscle ache you get the first time you do a new exercise, as they don’t go away when you repeat the same activity.
General aches and muscle pain are signs of tired muscles and are nothing to be concerned about as long as they don’t persist. You shouldn’t feel this sort of pain for longer than a couple of hours after you finish exercising. Sudden pain may indicate muscle or tissue damage.