Trainer Tony Greco sculpts Carrie's gorgeous gams!

Newlywed
Carrie Underwood has always been beautiful, but recently, her style changed from ho-hum to red-hot. It's easy to see why she now prefers minis to jeans — her legs look incredible! Fitness specialist
Tony Greco (
grecoleanandfit.com), who trains the
American Idol champ when she's in Ottawa, Canada (where her hubby, Mike Fisher, plays hockey), tells
In Touch the secret to Carrie's toned legs is a varied workout. "She trains like a pro athlete," reveals Tony, adding that during her 45-minute sessions, the singer does walking lunges and jumping squats. As to how she stays on target, he admits, "She's very competitive!"