Kayla Itsines, fitness star launches fitness app!

SWEAT! This is the new fitness application for women designed by Kayla Itsines, and every girl should have it! linkKayla Itsines is a 24 year old certified personal trainer from Australia who has created a global movement (literally) with women looking to get in shape. 3 years ago, Kayla created a 12 week workout guide…