I usually disregard "new" fitness opinions. I consider most things a fad/opinion until I see 3 research studies that support the claim - only then, do I take it seriously enough to consider it fact and consider making changes. I have been hearing a LOT, though, about exercises that one shouldn't do after a certain age (usually 40 or 50 or they'll mention seniors). Recently, some of these claims are being made by physical therapists. Now... I DO take the claims of chiropractors, physical therapists, and orthopedic doctors/surgeons seriously, because they are often dealing with injuries and have knowledge of what caused those injuries, even if they haven't done a research study on it. There are quite a few moves that shouldn't be done, because most people do them incorrectly. I'm careful with my form, and find Cathe's form pointers to be an excellent reminder that keeps me focused. BUT, I keep coming across 2 exercises that specialists in the field say cause more risk/damage than good even with proper form: Weighted squats and weighted deadlifts. Cathe always seems to be 10 steps ahead of everybody in fitness knowledge/research, and she still uses those exercises in her workouts. So, can anybody shed some light on this subject? Have any of you had issues with these exercises? Have your doctors expressed concern? Does anybody skip, modify, or substitute these exercises due to concern that they could be harmful? Or are you still doing them as shown in the workouts, because of the benefits they provide? Has Cathe ever addressed this info (videos and articles) in any of her articles, on her F.B. page, or in response to a similar question about specific exercises over a certain age? I don't trust everything on the internet, so I just wondered if anybody was familiar with research or evidence from a trusted source that recommends not doing or continuing to do them with from form.