James Dunne has a great channel with a variety of topics.  In this video, he analyzes the running form of a 2:24 marathon runner, Ben, focusing on how his technique adapts across different paces. The key elements discussed include stride length, foot strike, and arm movement, emphasizing the importance of not overstriding while maintaining good form. As the pace increases, Ben's stride angle opens up, and his foot lifts higher due to elastic recoil and muscle engagement. The video also compares Ben's form at slower marathon paces with world-record marathon speeds, highlighting his ability to remain efficient and avoid overstriding at faster paces.

Fredrik Zillén - Running Technique Specialist is a great technical channel about many aspects of running. 

In this video, he is discussing the topic of body lean while running. He summarizes his two previous videos on the subject. In the first, he explains that most runners lean too much, with only a small lean of 3-4 degrees being optimal. Reducing excessive lean can improve energy efficiency and decrease ground contact time. The second video debunks the myth that leaning forward more makes you run faster. Instead, he emphasizes that the feeling of falling forward while running comes from the shift in the center of mass relative to foot placement, not the amount of body lean. Zillan stresses that many runners misjudge their actual lean and that filming oneself can help correct these misconceptions.

Summary
* Lifting your feet higher actually costs less energy than keeping them close to the ground.  This is because lifting your feet creates a shorter lever, which requires less energy to move.
* The key is to relax your feet and let them swing up naturally. This is a much more efficient way to move your legs than actively lifting them.
* This is a common mistake among recreational runners. They often think that keeping their feet close to the ground saves energy, but this is not the case.
* There is evidence to support this claim. The speaker used 3D cameras to measure the energy expenditure of running with different foot positions. The results showed that running with a higher foot position used less energy.