@remax20in r/trackandfield • Recommends
On “Please help fix my Sprinting Form (Left leg doesn't come up all the way, right femur broken two years ago)”
No worries. And yeah, end of the 400 probably isn't a very fair example, hah.
Even if you can't get your knees very high for a reason like yours, you could instead try focusing on getting your left heel up higher as it comes underneath your butt.
Michael Johnson was a special breed of athlete, but if you look at his form, you'll see that his knees didn't actually come up all that high - but his heels do, and runs very upright as well.