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@Dammit
Went to the gym today, then before having a shower I ran round the perimeter of Peckham Rye.
What was interesting was the shear amount of work your lower leg -in particular your calve- does when running with a forefoot strike.
I ran at a couple of different paces, both on and off the path, and the difference in surface was extremely noticable- much lower calf loading on the grass.
Really shows how much harder you hit the ground on tarmac.
It's also demonstrated that my calf muscles are rubbish.
I managed once round the Rye- any more than that and I think I'd be walking on my hands tomorrow, my left calf is extremely stiff right now.