Most training plans treat every week the same. Your body doesn't. Phase reads your cycle from Apple Health and reshapes your program around it: build through your follicular phase, peak in your power window, ease volume through PMS, deload near your period. Underneath it's a full strength tracker — plate math, rest timer, RPE, e1RM, automatic PR detection — plus a complete Apple Watch app. Your cycle data never leaves your iPhone. No accounts, no ads, no analytics, no server to leak it.