I've been working on these for about 4 months 1-2 times per week. I've seen significant improvements in my depth (also thanks in large part to the Front Split series). One issue I think I have on the J curls is stiffness /lack of flexing in my lower and mid back at the bottom of the curl. Is this something that will improve by continuing to do J curls or are there other movements/stretches I should be doing? (I've been doing Foundations 1 along with all three stretch series)
Any tips are appreciated!
(sorry about the video cutting short on the last rep. I ran out of space on my phone)