I know, I seem to be doing a bunch of biomechanics posts of late, but that's where my brain is at so that's where the blog is at.
Following up on my last post about keeping my legs close is understanding how my right and left leg are different, how that affects my riding, and what I need to do to make them more even. My left leg is the stronger leg, and tends to stay more under me and doesn't brace or swing.
Let's start with the obvious differences. In these pics, I'm not actively focused on doing anything different with my legs. Let's call this "normal":
Final set: I'm actively focused on pushing my right heel away from the horse, bending my right knee, and keeping contact between the fabric of my breeches and the thigh blocks: