Different Stress Points: Closing legs OR crouching while hanging

When I crouch or do a fetal position type shape I get tugback.

When I close my legs together I get tugback, as opposed to opening them and getting a longer stretch.

I am wondering if this “shortening” or tugback will cause a more effective hanging session?

Has anyone else tried a similar workout? Close your legs together while hanging, or crouching a bit?

I have tried it. Crouching increases overall stress while closing legs together increases mostly skin stretch. If you want to effectively increase stress on ligs while BTC beside crouching try reverse kegels, bouncing and swingings. That are all good ways for reaching fatigue faster.