Peak Flow
Hi perhaps you have small lungs and/or a limited aerobic capacity for your age, as an example I am over 60 do not exercise much these days and regularly test at over 650 even now. Cycling and jogging should improve the capacity within 6 weeks if you train several times per week. The class one has to allow for deterioration with age hence the high start numbers in all categories. if you are healthy improve your fitness. That's it really...