Hi, this is Lisa with danceypantsfitness.com, here at Anytime Fitness, South Longview, Texas. Let's talk a little bit about the flexion of your knee while doing a lunge. First of all, the flexion is going to completely depend on your hip flexibility and your muscular strength. For instance, if I'm a beginner and I've never done a lunge before; maybe I have very very tight hip flexors, or I just don't have a lot of strength in my muscles, a lunge for me may look like this; just depending on your ability. And that's okay, you can actually get some work here, You can squeeze the muscles, you can do some little pultses. So, you can see my flexion isn't anywhere near 90 degrees right here. If I'm a little bit more flexible, little bit more athletic, I'm going to go down in a 90 degree angle is great here, especially if I'm doing more of a short stride lunge; really working the quadriceps right here. The further down I go, the harder this exercise is. If I do more of a long stride, I have the choice to not flex my back knee at all. I can go down and do a straight knee lunge, I can bend down just to grace the ground or again, if I'm a beginner, I maybe up a little bit higher and maybe not in so wide a lunge. So, the flexion of the knee again is going to completely depend on hip flexor flexibility and the strength of the muscle. And that's a little bit about the flexion of the knee in a lunge.