It says to "Show improvement... after practicing for 30 days." (emphasis mine)
It doesn't say "show improvement after 30 days."
When my son did this requirement, we were a bit unsure if he had to:
a) practice for 30 consecutive days, finally showing improvement 30 days later, or
b) practice 30 (perhaps non-consecutive) days and show improvement after whatever period of time that worked out to be, or
c) practice some number of times > 1 in a 30 day period and show improvement after 30 days.
He kept a log and, after failing to practice on consecutive days, decided to run down path (b). After about 20 practice days, we were a month and a half into it and he decided to ask his advancement chair if he was doing the right thing. The Advancement Chair said, "In all my years I've never seen anyone keep a spreadsheet! You pass." I take that to mean that for this particular Advancement Chair, the answer was ©.
I still believe the wording can be interpreted in any of the three ways above. ymmv. I feel sure that this requirement exists to demonstrate to the scout the value of regular exercise, a practice that will help him achieve the Aim of Fitness. For this reason, I don't believe that you can simply do the exercises twice, 30 days apart, and meet this requirement.
About the pullups... He still can't do a pullup. He did modified pullups where he kept his heels on the ground but leaned back from the bar. (When I was in school we called these "girl pullups") He was able to improve quite a bit with these, but not enough to do a real pullup. (This message has been edited by fling1)(This message has been edited by fling1)(This message has been edited by fling1)