Sorry to hear about your wrist. I hope you heal up soon!
Best advice for re-starting your normal training routine is to start soft and gradually transition back to your normal pattern. You will probably lose a little bit, but noticeable, amount of leg strength and possibly some fitness, but both will return shortly after getting back on. Continuing Z1/Z2 base cycling is a very good idea.
Good luck!
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Ride more.
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