+1 Greenwich Park. Such a good variety of hills to play with in terms of length and gradient, and also choice of tarmac or grass. (And if you do want a specific staircase work-out, the foot tunnel nearby has ~90 steps at each end, although you might get dizzy!)
+1 Greenwich Park. Such a good variety of hills to play with in terms of length and gradient, and also choice of tarmac or grass. (And if you do want a specific staircase work-out, the foot tunnel nearby has ~90 steps at each end, although you might get dizzy!)