What is the hardest parkrun then?
The hardest one that I’ve done myself is RICHMOND PARK. It’s only really hard because of the two hills towards the end; maybe exposure to a bit of wind as well as a few hundred metres on grass. You won’t get a PB there unless it’s the only one you do. It’s typically reckoned to be 30 seconds slower than what your PB shuold be.
Any others?, Anyone?
3 years on and we can answer a bit more scientifically: