Try these if you can already do 5 or more regular ones. Reasons being
They’re awesome for grip strength.
If you’re bored of the regular ones, these ones aren’t boring at all.
They’re awesome.
2 and 3 are pretty crappy reasons.
The reason I use it is that the pull up bar I installed at home wasn’t parallel with the ground. This created a balance problem, with me not hanging straight. So I threw a towel over it and no more balance problems.