Footflaps do you deadhang?
Not specifically, however some of my core exercises (GB Foundation series) do involve a lot of hanging off Stall bars. This is my current Core workout, 5 rounds of
[video]https://www.youtube.com/watch?v=Jn5CeRHajKo[/video]
Doing this 2 or 3 times a week at the moment, building up to 5 sets of 5-10 reps of each exercise, ideally with ‘perfect’ form. First exercise (negative body levers) I need to pike less (have got better since this vid), 2nd one is pretty decent form. 3rd one is crap as my hamstring flexibility is terrible so can’t hang with straight arms and then lift my legs to my hands, so I’m doing too much work with lats.