excuse my lack of knowledge on form but could someone explain the following quotes from Salazar:
"The fastest finishers had a higher thigh drive, for one thing; at its apex, their femur bone was almost parallel to the ground, like the front legs of a bounding deer. They also slapped the ground so quickly with their forefoot that the contact seemed almost incidental"
"Salazar wanted him to run more on his forefoot and also to strike the pavement more sharply—like you’re clawing at the ground"
"Comparing the video to one of Bekele, Salazar explained, had revealed several flaws in Ritzenhein’s form, including a problem with his elbow drive: the amount of thrust produced by the rearward pump of his upper arms. While Ritzenhein typically throws his elbows back at around a sixty-degree angle when he’s running hard, Bekele throws his back at almost seventy degrees—generating a correspondingly more powerful push. The comparison also identified a problematic gap between Ritzenhein’s knees at the moment when his front foot struck the ground. Freezing the frame, Salazar targeted a wedge-shaped space between Ritzenhein’s thighs. That gap reflected both Ritzenhein’s tendency to heel-strike and the sluggish recovery of his trailing leg"