The 21st century woman barely has time in her schedule to hit the gym, and the hottest fitness centers in the country are responding with a workout revolution. "Fusion and time saver classes are the biggest fitness trends emerging this year," says Tanya Becker, Co-Founder of Physique 57 (www.physique57.com). "People want to do a workout that combines a little bit of everything and get the most efficient workout for their time and investment." Classes at this of-the-moment studio are for the modern multi-tasker, simultaneously working several muscle groups. For girls on the go, Physique 57 offers an array of 30 minute quickies that will tone your arms and abs.