So indeed basically you need to ride enough to know how these things work and not just read about it and train according to a program. Do intervals or something to get the speed, long rides to get used to it and to learn how to do it. Even though I had been riding for years before I started randonneuring, it took about two seasons of that to not feel battered after a long ride. ymmv
Chris White explains some of the training here .
So indeed basically you need to ride enough to know how these things work and not just read about it and train according to a program. Do intervals or something to get the speed, long rides to get used to it and to learn how to do it. Even though I had been riding for years before I started randonneuring, it took about two seasons of that to not feel battered after a long ride. ymmv