Despite not looking like a skinny runner, this guy gives some great tips and pointers-along with excellent reasoning.
This one is suburb for me. I put the band around a bedpost and wrap it around the top of my legs. It really get you working on the glutes and a proper hip hinge.
This one is great for my foot. It helps keep my foot for rotating out further than it already does.
I am working on this and still evaluating it for use on my hip joint (due to arthroscopic surgery), but it is a better explanation than other videos I have followed for opening up my tight hip joint.
This one is a killer for me. I did it one night and felt good, but the next morning my lower back and hip was so tight I could barely put my shoes on. It did seem to target some weak lower back muscles, so I will keep working on this to see how I progress.