Notes
Ran at approx same pace as Passion Run to benchmark HR. First 7k was net uphill, then net downhill for the next 11k, then net uphill again to the finish and fighting headwind as well. HR was 6bpm lower than Passion Run. In terms of economy, today was 163 bpm x 108mins = 17604 beats/25k = 704 beats per km, while Passion run 169 x 109mins = 18421/25k = 736. Therefore, about 32 less beats per km or 4.6% less effort.