I'm just starting on the Primal Blueprint - eating and exercise-wise!

I'm following Mark's recommendations for the bodyweight exercises and am doing quite well building up the number of wall push ups, squats and (at the moment, very wobbly!) planks that I can do. Where pull ups are concerned, it's a non starter. I tried to do one yesterday and couldn't even get my feet off the ground!

I should mention at this point that i'm pretty overweight, pretty unfit and have very little upper body strength! My husband always thinks it's funny how weak my arms are - much to my annoyance!

So if anyone has any suggestions for what to do to build up my strength so that I can one day attempt a pull up, I'd be very grateful!