I can't get my back engaged with pull ups
What ever I try I don't feel the pull up in the back only the biceps and a little bit shouders, i retracted my shoulder blades, opened my chest, tried everything the second I'm in air my back isn't even trying.
I have rounded shoulders and tied chest muscles but I'm trying my best and it's nothing I don't know what to do.
I probably never worked my back muscles properly in my life so I understand why this is so hard but I see the group of muscles that's supposed to work with pull ups it's a huge part of the back and I feel like 5% of it.
Please help.