Once you get to doing longer rides you need to up the training, here are some top training tips;
1/ use a course emery paper to rub layers of skin of your backside and dowse with surgical spirit afterwards to toughen it up.
2/ Find a spot in a Motorway layby next to a rainfilled pothole and do deep knee bends whilst being splashed with rainwater and road grime by passing cars, [ this needs to be done for at least 60% for the expected ride duration]
3/ glue half pebbles and stones to the saddle of your bike and ride over bumpy/cobbled streets to toughen the sit bones, this can also be done by an obliging partner with a club hammer or a local proffessional at a cost. [consult your local Tory MP for the latter]
4/ buy an old Carradice saddle bag at a jumble sale, tow it home behind the car through fords and rough tracks then tie it to one side of the saddle rail with an old toe strap, for the proffessional lopsided look.
5/ For summer rides, get a partner to burn your forehead/ nose and ears with a magnifying glass to prepare the skin for it's forthcoming ordeal.
[tan lines on limbs and crazy helmet patterns on the head are optional.]
6/ Practise reading and riding routes and staying upright and on the right side of the road.
[well on the continent anyway, stay on the left here]
7/ Use sections of old handlebars super glued to the palms of your hands to toughen the skin and get used to the feel.
8/ Go into an old peoples home and say something cheerful and wait for the [silence of being ignored if you are lucky] the terse arguementative reply and look of disdain, this will toughen your resolve for holding conversation with other Randonneurs.
9/ Winter training; soak your cycling kit [shoes et al] in water for two hours then place them in a fridge overnight, put them straight on in the morning and go out on your bike [or longer knee bend session on the motorway layby]
10/ night riding training; as per instruction 9 but also wearing a headtorch and reflective gilet.
I'm kidding of course, except 6 that actually happened once