Would you ever sign up for a marathon without running a single mile to prepare? Would you expect Serena Williams to return to the court after a major injury without a period of rest followed by intense rehab with her trainer? Of course not! But somehow the norm for pregnancy and postpartum is for women to experience a 25+ pound weight change in less than a year, deliver a baby via abdominal surgery or the vagina, and mysteriously “bounce back” to normal activity, appearance,