Wanted to share an exercise I’ve been using a lot lately with runners that have hip abduction and/or core weakness contributing to knee pain as they exercise. It is a basic side plank performed with the top leg performing a running-like swing motion. This extra movement really forces the lower leg hip ABDers and core to work a lot harder. I performed this exercise with my bottom leg bent but it can be progressed to a straight leg version for more advanced athletes.
My technique is not perfect in the video as I was sliding a lot on the gym flooring I was on but you will get the idea from the video: