I did a 200k 2 weeks ago that wasn't very pleasant. The return leg was very windy, up huge hills (I had to pedal DOWN the hills because otherwise the wind would have blown me to a stop) and it rained.
I was cold and wet and tired. Nothing for it but grit the teeth and turn those cranks.
Of course, 10 minutes after the finish, with some hot soup and tea in me sitting with feet up, it didn't seem so bad!?
Stew
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The older I get the better I used to be.