After a winter spent recovering from the November fall that left her with a broken wrist and between 40 and 50 stitches in her face, Carrie Underwood looked strong and swimsuit-ready at a May 4 event for her Calia by Carrie activewear line. Her secret? “She got back in there as quick as she could,” the 35-year-old’s trainer of 10 years, Erin Oprea, reveals to Us.