This is the best video I have seen on natura running form: https://m.youtube.com/watch?v=zSIDRHUWlVo

Also, The creator of the pose running method recently released a new book that details proper running form step by step with specific exercises and instruction:

The Running Revolution: How to Run Faster, Farther, and Injury-Free--for Life https://www.amazon.com/dp/014312319X/ref=cm_sw_r_awd_ZXiOub1...