Hello
I'd like to improve my upper body strenght and since I have no acess to a gym, I'm just using the public chin/pull up bars in the local park. I've been going through with a regimen of 6 sets of as many repetitions as I can pull off, with a day rest between sessions. It seems to be working, since I'm able to pull off more repetitions in the next sessions than I did in the previous ones.

Here's the question: most programs I've seen say that a day rest between sessions is the way to go, but there is also some people who claim that a 5 day rest is better for increasing strenght. What's your take on this?