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www.livestrong.com/article/541597-are-leg-extensions-bad-for-the-knees

Although the leg extension does provide you the ability to isolate your quads, it isn't without risk, especially to your knees. If you do choose to use it, make sure you have proper form and only add the amount of weight that's appropriate for your fitness level to keep your knees safe.

www.aworkoutroutine.com/leg-extensions

QUESTION: I see a lot of people online making fun of the leg extension machine and calling it the most useless leg exercise there is.They all say that if you’re trying to build muscle, you shouldn’t ever waste your time using it. I’ve also heard some people say it’s really bad for you knees.

www.jasonstake.com/leg-extension.html

Due to the fact that the leg extension is an open chain movement, there is no such counteractive force. That, in a nutshell, is the physiological reason why the exercise is deemed to be bad for the knees by many experts. Especially when the loads become greater. Leg Extension And Knee Laxity

www.curejoy.com/content/leg-exercises-for-bad-knees

Best Leg Exercises For Bad Knees. These exercises put less strain on the knees and will activate all leg muscles. Don’t do high reps – limit your reps to a maximum of 15 per set. 1. Reverse Lunge. This is an effective lunge variation for strengthening the quadriceps, hamstrings and the glutes.

www.reddit.com/r/Fitness/comments/31ztbx/are_leg_extensions_bad_for_your_knees

Are leg extensions bad for your knees? (self.Fitness) ... Yes, leg extensions are bad for your knee and ACL. Not to mention squats, lunges, split squats, leg press, and other compound lifts work your quads better. Stick to quad exercises where you also move through your hips.

seannal.com/articles/training/leg-extensions.php

Are Leg Extensions Bad For Your Knees? Although most people will give a black-and-white “yes” or “no” to this question, the real answer is that it depends on your individual body structure, and it depends on how you perform them.

weighteasyloss.com/leg-extensions-bad-for-your-knees

Leg extensions “bad” for your knees? Bad is in quotes because it should be taken with caution when used to describe an exercise. Here is the deal with the leg extension machine, the reason it is portrayed as a “bad” exercise is because of the high torque levels produced at the knee especially at specific […]

www.t-nation.com/training/truth-about-leg-extensions

Steinkamp et al (1993) examined patellofemoral joint reaction force, knee movement, and joint stress at four different angles of knee flexion on the leg press and leg extension. The group found that all three parameters were greater with leg extension exercises at 0 and 30 degrees of knee flexion – the most "functional" ranges of motion in ...

www.stack.com/a/never-do-leg-extensions

Stress on the Knee . During Leg Extensions, the resistance is located at the shins, just above the feet. This causes shearing forces on the knees, which means the force is experienced horizontally ...