[Horus]

I've noticed that I can do different numbers on different pull up bars at the gym, even with identical hand spacing, which I haven't been able to work out. Perhaps one bar has more flexibility than others allowing a spring effect to help with upward momentum. Anyway, I've been focussing on these lately and I've got up to 8 (on the "easier"bar) from only 3 a few months ago, partly due to strength gain and partly weight loss. It's a slow process.