I wouldn't say that's a weak back picture at all...
Edit: Also, why block out the face in the first and leave the last?
Back doesn't look that weak to me - for a start you can do a lat spread!!
Nice size there really, how tall/heavy are you?
holy crap ethos, you have a colossal back!
Strong looking back and arms ethos.
Whats your height and how long have you been training?
I'm about 6 foot and roughly 205-10lbs at the moment
Heres a video of me doing pull ups. I did 2 reps before the camera started filming, wasn't sure when the timer was going to go off. 7 easy reps.
that looks like a semi-supinated grip to me? not a proper pull up then
thats the easy version
you do have low body fat, time to start eating big
Not a proper pull up? Those were hammer grip pull ups.
yep exactly, a pull up is overhand grip