Janey Sweet's boss is deathly afraid of fat people. And when Janey gains a little weight following her divorce, he gives her an ultimatum: Lose thirty pounds or lose your job. So Janey throws herself headlong into the fitness revolution, signing up for a morally suspect workout pass, baring it all for Free the Nipple yoga, sweating through boot-camp classes run by Sri Lankan militants, and spinning to the screams of a spandex-clad instructor with rage issues. But when Janey meets Sara Strong, the wildly popular workout guru whose special dance routine has starlets and wealthy women flocking to her, the results seem too good to be true. Is Sara a con artist cashing in on women's insecurities? Or is Janey just really, really hangry?