New road bike after 25 years: what soreness is normal?

[tiva]

How's your core?
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Pretty good--in the winter, I skate ski or classic ski 4 or 5 days a week, and in the summer, I teach sea kayaking and rolling. But off seasons aren't the best for keeping my core in shape--I hike with the dogs and work on our farm, but that's not really core work.