Help for build-up

I did Paris to Blackpool last year, but geared. Was thinking of getting the eurostar over and cutting out england. Then a 2 week round trip. Doing it fixed though not wanting to pass through any mountain ranges...

Eingangs trip was 1500km if I remember correctly... fair play to him that is a long way fixed.

1514km in total, you're right, with a lot of hills in france and the pyrenees at the border. 60km tough up and down twisting road.