A suggestion originated in the early 2000s that the high hormone levels derived from a stimulated IVF cycle would encourage a non-receptive, out-of-phase endometrium, the concept arose that adopting a freeze-all approach would not only minimize the risk of ovarian hyper response syndrome but maybe even improve pregnancy rates in the general IVF population. The Freeze all Embryos or Fresh Transfer strategy was initially a ‘rescue’ strategy for women at high risk of ovarian hyperstimulation syndrome; however, this approach has been extended to other indications as a scheduled strategy to improve implantation rates.