Interpretation is everything: no pain, no gain
No pain, no gain is an old idiom, and It can be found in biblical text, poetry, and your local gym. As far as the fitness myth is concerned the saying likely came about because of the resulting soreness after a workout. Thus, no pain, no gain.
Now when you are exercising there are two different types of pain, beneficial and nonbeneficial pain. Beneficial pain is the muscle soreness after a good workout session. Nonbeneficial pain such as joint and back pain, resulting from a particular exercise or workout session are no good.
Listing to your body is the key when it comes to no pain, no gain. Is this exercise damaging you in some way? Or is it helping you to achieve your goal? You must weigh the risk and the benefit to any exercise and ensure that you are preforming the exercise correctly. If you are correctly preforming the exercise and you are feeling that something is wrong with your body then you need to stop. Also, if after the work out you find that you are in a lot of pain then you need to go see a doctor and talk to them about any pain you are feeling due to exercising. Once you get the green light from your doctor then you can analyze your routine and seek out help from a trainer. Because if you do not listen to your body and you misinterpret the idiom no pain, no gain then you can end up permanently damaged.