The idea behind not going to extreme angles with the knees is more a traditional one… traditionally it’s always been thought of as safer not to.
Many say that that’s hooey these days and I can understand the reasoning behind it. But any of my clients who experience knee pain immediately flare up if the angle exceeds 90 degrees and are fine to pump them out if it doesn’t. For this reason, I get all my clients to try and keep this unless we are talking ATG squats or quad dominant leg press. Neither of which I use much.
You can do what you like with your knees, but this is why I do them this way. [/quote]
I understand what you are saying, however, I wouldnt consider already injured clients having pain when doing an exercise a good reason not to do the exercise. What you are basically saying is that you dont think the knee should travel past the ankle, when doing split squats and lunges. Look at anyone doing a proper front squat, non-powerlifting back squat, or one legged squat and you will see that the knee travels well past the point which you say is dangerous. In those exercises it is near impossible to avoid this. But it is possible to avoid this doing split squats and lunges, and that is the only reason this is even being talked about. If you arent letting your clients knee travel forward you are doing them a diservice (the uninjured ones) because they are not getting the most out of a quad dominant exercise. Would you do bench presses with someone that had bad shoulders?
Probably not. Well I guess that exercise is bad for everyone, just scrap it. Go tell the authors of the site your new found information.