I was lucky enough to see this during the week – a video of Marcell Jacobs JOGGING & Sprinting in Slow-Motion from Tokyo Olympic Games, captured by PJ Vazel.
His form is wonderful, from his stance foot landing under his centre of mass (watching him float forwards allowing him to pull back and land his stance foot is great) with no gap between his stance & floating leg. All his energy translating into back and down – maximising his elastic return, then as the cycle moves on, when he reaches the toe off stage his ankle stays fairly rigid and he achieves this lovely combination of a perpendicular float leg, with the forward leg reaching a great angle of hip flexion. Allowing him to continue in this cycle. His arms (elbows) staying in tight on the front side, with his hand coming up to his mouth. On the back side not reaching too high with that rear elbow.
Thank you to Jonathan Marcus for sharing – watching it is mesmeric and as a model to work towards so, so helpful.