So recently I posted on twitter about a sudden gain in strength:
I have conquered pull-ups!
On Saturday night I could do 1.5. Today I could do 11!
(Chinups were always easy.)
To put that more into context I should give a few more details. In the past I've been using an assisted pull-up machine, which offers a counterweight to make such things easier.
When I started the exercise I assumed I couldn't do it for real, so I
used the machine and set it on 150lb. Over a few weeks I got as far as
being able to use it with only 80lb. (Which means I was lifting my
entire body-weight minus 80lb. With the assisted-pullup machine smaller
numbers are best!)
One evening I was walking to the cinema with my wife and told her I thought I'd be getting close to doing one real pull-up soon, which sounds a little silly, but I guess is pretty common for random men who are 40 as I almost am. As it happens there were some climbing equipment nearby so I said "Here see how close I am", and I proceeded to do 1.5 pullups. (The second one was bad, and didn't count, as I got 90% of the way "up".)
Having had that success I knew I could do "almost two", and I set a goal for the next gym visit: 3 x 3-pullups. I did that. Then I did two more for fun on the way out (couldn't quite manage a complete set.)
So that's the story of how I went from doing 1.5 pullus to doing 11 in less than a week. These days I can easily do 3x3, but struggle with more. It'll come, slowly.
So pull-up vs. chin-up? This just relates to which way you place your hands: palm facing you (chin-up) and palm way from you (pull-up).
Some technical details here but chinups are easier, and more bicep-centric.
Anyway too much writing. My next challenge is the one-armed pushup. However long it takes, and I think it will take a while, that's what I'm working toward.
http://rozie.blox.pl/
I strongly recommend you to mount pull up bar at home - this is very short and intensive excersise, so you can train each day a few times - progress is really impresive. I have one and it's really great. There are versions which allow to be mounted in door space. If you decide to buy one, choose version which has parts attached (screwed) to jamb and holes at the ends of the bar - very good for safety and stability.