Hi there ladies... if you want a training programme to build yourselves up you will find lots and lots of suggestions and calculations in journal aricles and various books. As a newbie this didn't help me at all.
I would recommend, however, Gale Bernhardt's "The Female Cyclist: Gearing up a Level"
She outlines not only a build up of several months and what type of rides you should do each week. She also explains what each type of ride is and what it achieves. She also explains how you can adapt them to your level of fitness, or to the time you can commit to training.
She has about 5 plans (sorry not to be more specific but my partner is still asleep and the book is on my side of the bed) for centuries, improving hill climbing, time trials and a couple of other things.
Well worth either buying, or borrowing and phhaving a close look at that chapter.
Apart from that, getting ready for long distances, ride, ride, ride. Increase your distances by no more than 10% in a week, and be consistent in your time on the bike!
Most importantly, have fun!!!



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). Since you can easily ride 21, the 50 might be a great challenge for your first group ride. 
