Your fitness history and age is similar to mine.

I suddenly up'ed my mileage from just a few miles a day to 25 in one day (which I only have time to do once a week unfortunately).

Super easy and you'll love it!!!

Just remember to stretch and get a fitting... I kind of sprained my knee (which my doctor dad says is from overcycling), so any gradual increase you can do is more for your body's healing sake.

How exciting, hope to hear your update!