General rule of thumb is 3 weeks post if you can sit and walk pain free with doctors permission (we have a letter you can send your OBGYN or midwife) While you do not have to start this early, if you do ReCORE when you feel mentally ready and that is a few weeks/months later, that is fine! Even if you didn't hear about ReCORE and you are 10 years postpartum, it is not too late to recondition the inner/outer core!