Welwyn - Whitwell - Harpenden training run

Another 40 miler to add to the training runs. Warmer today although windy again, a nice run.

An interesting point I've noted from route planning using Strava. Looking at the first three full days, from 20 miles S. of John O'Groats to Glencoe, and comparing them with actual runs in Herts, Bucks and Oxon, the height gained per mile isn't that much different. This may bear out comments I've seen saying that the climbing in Devon and Cornwall is harder than that in Scotland. Once I get down to the SW in detail I'll be making the same comparison.

	miles	gain in ft.	gain in ft./mile
D2	57.4	3818	66.5
D3	66.5	3523	53.0
D4	57.2	3432	60.0
Chilterns	49.3	3065	62.2
Welwyn	39.7	2113	53.2