Of all the exercises in F1 this is the one I have struggled the most to understand. Some say protract more but there is not more than max? Some say hips lower = harder, but planche is straight so why not train straight(?) also when lowering hip I lose form in back and all tensions goes to shoulders. I hear "depress" but see athlete in the video "lift" his shoulders, making me struggle balancing between tension in the shoulders from arm angle(/depression?) and traps/upper back when doing as in the video.
I feel my sPL training has close to only been about trial and error, and locked at block 2. I finally (today) found a way to keep the back straight by activating a muscle in the middle of the middle back, I think it may be the one called "serratus posterior inferior"? I try once in the clip to depress using the lats but it makes me lose the tension so I return. I feel pretty strong but handicapped by a lack of understanding of this PE.
I don't think I can protract more, even when just standing up (like Dillons demonstration) or doing it standing to a wall. Maybe can make it look so by rounding the back.
What to do? Anybody got medicine for this frustration of mine? Form check from experienced?
video here:
http://youtu.be/14_rVvubcVE