Carrie Underwood was a winner at Sunday night's GRAMMY Awards, but it was her toned physique that nearly stole the show. ET's Kevin Frazier spoke with Underwood after her powerful performance of her new single, «Ghost Story,» and how she got those legs everyone has been talking about.«I love fitness,» Underwood gushed. «I do have a fitness app called Fit52, and I practice what I preach, so, I love to work out and it’s nothing really complicated, things like squats and lunges and things like that, but I do like to work out. I like feeling strong.»Underwood's legs weren't the only winner. The alum also took home a GRAMMY in the Best Roots Gospel Album category for her album, . «It means so much,» she said of the big win.