I want to change my workout routine a little and do Leg Extensions and Curls. Since I'm already lifting heavy on other exercises, I want to do the two with relative light weights but thererfor high reps.
I have heard about so many people complaining about knee pain or even injuries after training with these two machines. And often these people are the ones going heavy on Leg Extensions and Curls.
So I'm wondering, when performing with light weight, which I can easily perform let's say 12-15 reps with, are these two exercises as harmful or even harmful at all?
My main goal is to get hypertrophy going and build some muscle. I'm not debating on weither these exercises are necessary or helpful towards my goal, because I've found that opinions in such cases differ very much. I just want to know about the injury/pain risk to feel safe when performing these, so to say.