under-rotation?

Yes, pulling with the trunk, kind of that, by also retracting the shoulder blades a bit to build a solid connection between the arms as if they were a kayak paddle. This shoulders connection comes with a cost however, in fact I highlight it only when sprinting or swimming the 75's. At steady pace I'm still leaving the shoulder blades less connected.

20x50 bands in under 45 sounds very good! Are you going to update the "50/100m challenge" thread soon?

s.sciame wrote:Hi all,
some more thoughts about (upper body) rotation. Yesterday I watched again this famous video (see from 7:50):

https://www.youtube.com/watch?v=Cb1Supmb2TQ&t=258s

Hi,
As he mentioned in the above video that not the pull but the recovery of the arm leads to shoulder injuries, absolutely right! (cottmiler, please note this and keep in mind while swimming)
* That's why I have been doing the below drill since I had an operation from my shoulder in 2012. This drill keeps my rotation in the safe region and provides to teach my body the healthy(proper) recovery.
100m crawl, mixed doggy paddle drill (footage: https://youtu.be/OWLcH_MacbM , SPL:16-17, Pace:1:20, this my all day pace by the way)