Cycling and jogging should improve the capacity within 6 weeks if you train several times per week
Sorry, can't really agree with that ! PFR is one of the human parameters where you find yourself at a certain point on the (wide) spectrum which is called normality, and little that you do is likely to change it much, if at all ! Most healthy adult male pilots' PFRs are in the range of 500 - 700.
The figures quoted by the OP are very unlikely to raise any eyebrows at the Belgrano, unless there is a specific history of treatment for asthma or something similar in childhood. In that case expect to be instructed to RUN around the building, and have the PFR re-tested on your return !
