Hi Harris. I generally mind my own business (particularly if the person is working out with their trainer). I agree that interfering in such a situation would be extremely unprofessional and humiliating to the trainer involved. That being said, I have on very limited occasions made a ‘suggestion’ (I would not use the word “correction” because that word in itself indicates that the person is doing something wrong – even if they really are, some will get defensive about it) to someone who to me clearly is a beginner at exercise and not sure what to do. I feel that interceding in that situation is truly the professional thing to do in that I think that we as trainers can serve not only as advocates for fitness and exercise, but also teachers to those who may not know what they are doing and have no one to ask. Even when making such a suggestion, I have always first asked the person “do you mind if I give you a suggestion…” I recently did this with a woman in the gym who was CLEARLY doing something wrong to the point of possibly injuring herself – she thanked me profusely afterwards. I think it really boils down to HOW you approach someone in such a situation.