Hi, I'm 67 now and can't run better than 21 for a parkrun. My cadence is fairly poor at 150 and I take it that's brain processing. Do I really need to increase it? I tried 180 with a metronome and could only achieve that for a few minutes. I'm beaten by new to the sport (say 20 years) men of my age with no county background. I can't run 2 miles at my old 20 mile speed and I feel that's too much of a decline. I'm doing something wrong.