@xtremezeker14in r/Sprinting • Recommends
On “Is it okay for my arms to bend at the elbows or should I keep them 90 degrees throughout the entire swing?”
Try leaning against a pole/wall using your hands, and drive with your knees, thus way you'll get used to stay low. I still struggle with that myself but I can say I'm improving. You are trying to active something like this
link to this video