I think no pain no gain could mean that you need to do a sweat driving and tough workout to get results. I don’t think it means actual physical pain that is bad for your joints or back. That type of pain is a sign that the person either isn’t fit or healthy enough or the exercise is not for them. I think a lot of unfit people push it too far. I think that someone overweight needs to just walk and lose weight before they try to take it further.