a leg extension working the quads. the mirror muscles are the ones people want to target the most. the quad is the biggest most impressive muscle. if you look at what s happening here, a lot of load at the ankle. there s a torque on your knee. we are worried about the cart ledge in the knee. look at a better movement to prevent wearing down the joints. you want to slow that down as long as possible for longevity. you say a good rule of thumb, if it looks ridiculous, it probably is. exactly. the hip abduction machine fit that is bill. the only thing worse than doing this is making direct eye contact with someone else while doing this. this machine always scared me. i take care of a lot of back injury and i worry about this. you have all this load in this part of the back with it. loaded flexion of the spine is