A discreet (to deter nosy siblings), simple (who has a ton of time?), explanatory book (an actual tracking book, no app required) based on NaPro Techonology and The Creighton model for pre-teen girls, teens, young adults, or grown women who want to know what's going on cyclically in their amazing, intricately designed bodies. Bonus - this includes how women may feel mentally and physically with ideal ways to fuel their body during each phase...