A mate of mine just did loops of Richmond Park in London, totalling the best part of seven hours and thirty plus miles last weekend, as part of training for an ultra marathon in OctoberNever done one myself tbh, so can't relate. Do Park Run every other week when my brother's football doesn't conflict but than that I don't bother. The loops at Park Runs I find a touch boring, but if they're flat enough like at Widnes then I can persevere.
Now that is mind over matter !!!!