There's a couple of different ways that you could do a Power Lunge. You're going hear people say that this is a Lunge we're going down and coming up which is not wrong. But Lunge does imply that you are moving through space. I would call this a split stands squat. So what they called a split stand squat or a lunge it's all the same but what makes it power is that you're bringing more work, more effort and more speed like power's work over time. So to take that movement and make it more powerful you'd want to move with it so this could be a power lunge. You are increasing the stretch of the muscle and firing it just like stretching a rubber band and bringing it back in. I would call this an alternating front lunge some people call it a power lunge. Another way that you could do it is to take that split stance squat without stationary lunge stance and literary jump it coming up and land it right back into the lunge position. So firing up all the muscles of the lower body exhale up and again that's checking that movement making it more powerful. You could even alternate that for more of a challenge coming up and then switching using your arms to be more functional about it or taking out your arms and making it harder to propel yourself -- all great variations of a power lunge.