Is the seated leg extension bad for you ADVERTISEMENT 382 viewsMay 30, 2013 0 Jessica May 30, 2013 0 Comments I’ve heard the seated leg extension machine was bad due to the torque placed on the knee. My co-worker disagrees 4 Answers ActiveVotedNewestOldest 0 Jeremy0 Posted 0 Comments A better question is can we strengthen the muscles in a different way without using that machine and the answer is of course. You are viewing 1 out of 4 answers, click here to view all answers. Register or Login