Either my strength or my flexibility, or both even, is lagging significantly as I'm struggling to do 1 correct rep with my knees locked out in a straddle and bringing my torso to a vertical position as shown in the video. Does the width of the straddle matter, as I'm unable to bring myself up for even 1 rep. I've attempted 5x15 with the first progression on two different occasions just to make sure that I can actually do it and not fail halfway (it was quite the challenge, couldn't feel my abs the next couple of days...) Did the workset, then the mobility exercise, and repeat for 5 sets. Any advice on how I can actually get the form down for this? I'm willing to do even 1 rep for 3 sets until I can actually get it right...
Edit: torso to vertical position sorry cant think straight ><