Only a few have successfully parlayed supremely successfully professional careers into equally successful careers as coaches; Liz Irving is among those in this rarefied air. She's reached world #2 as a player, helped Vanessa Atkinson make the leap to world #1, and famously coached Nicol David during her illustrious reign as queen of squash; that's an impressive resume. Liz looks back at her promising junior career, the changes she made that took her to world #2, coaching the aforementioned two world #1s, and putting all of this expertise into her new squash app, Squash Lab.