Long before Katherine Heigl, Allison Williams and millions of others were following her Bikini Body Guide program, Kayla Itsines was just a trainer with a bad reputation.
Or, rather, a reputation for being a bad ass. When women would come into the fitness center seeking personal sessions, the native of Adelaide, Australia would ask if they were interested in a 30-, 45- or 60-minute routine only to inevitably be interrupted from someone in the gym's far back corner: "Do not do the hour!" came the warning.
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