

Personal trainer Erin Oprea didn’t know the first thing about country music when, 13 years ago, singer-songwriter Aubrie Sellers and her mother, Lee Ann Womack, enlisted her services. “It’s only in the past year that I learned what a bass is — that it’s not a drum,” says Oprea with a laugh. Since then, she has become one of Music City’s most in-demand fitness gurus, helping to tone the likes of Kacey Musgraves, Maren Morris, Ryan Hurd, Kelsea Ballerini and Carrie Underwood. Here are three of the moves that keep them all in fighting shape.
Jump Around

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“A jump rope is the most versatile piece of equipment. It’s cardio outside of the tour bus,” says Oprea, who often integrates it into an interval-based Tabata workout. “I’ll have my musicians sing and jump rope at the same time so they aren’t getting winded onstage.” For the most efficient workout, keep your body and your jumps low to the ground, your arms bent at a little less than 90 degrees and your rope loops tight and narrow.
Activate Abs

Oprea’s “slowwww bicycle crunches” are straightforward but effective. Start by lying on your back with your hands behind your head. Bring your chest up, then take your elbow to the opposite knee while the other leg is fully extended. Pause in that position, making sure your back is not arched (if it is, tilt your pelvis to flatten). Hold and switch for 45 seconds. Then do another 45 seconds at a slightly faster pace.
Boost Your Booty

Get on your hands and knees with a flat back, then lift your left knee “like you’re peeing on a fire hydrant.” Point the toes, then extend the leg back. “You’re going to feel a good squeeze on your booty,” says Oprea, “and your knee should never drop from that angle.” After 20 reps, stay on the same leg and make 30 “itty-bitty circles” with your knee. “And then you get to do the next leg, because one butt cheek shouldn’t get all the fun.”
This article originally appeared in the June 1 issue of Billboard.