Welcome to the best thing in the world you can do with your time. Just keep at it and you will find that one day you won't even feel the discomfort and you will wonder what the problem was in the first place. You probably are a bit out of road cycling shape, but don't worry, just keep logging the miles. You have been bitten by the bug and noone is immune.....enjoy!
Cheers,
Brian
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“A good teacher protects his pupils from his own influence. ”
― Bruce Lee