Cautious…I think that you are reacting a bit too much…but even I would do the same thing if I were in your shoes …I guess! It’s important to know that exercises without a proper guidance or instructions can harm the muscles and you need to take a note on this. My brother, who is also a exercise freak…was on the same ship as your son for excercise to get six pack abs and later he found a great guide that not only made him have them but in a proper way that was comfortable to his physical and mental well-being. You can give it a look.