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This Is How You Get Carrie Underwood-Status Legs
Erin Oprea: How I Became A Celebrity Fitness Trainer
The 4 x 4 Diet: 4 Key Foods, 4-Minute Workouts, Four Weeks to the
How to Get California Fit With Trainer Erin Oprea
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Erin Oprea Penguin Random House
Erin Opera teaches a 25-minute HIIT workout for your legs