The viral 12-3-30 workout is fine, but there are better ways to spend your exercise time. Rowing and rucking are easy ways to combine cardio with resistance training to build muscle. download the app Email address Sign up By clicking “Sign Up”, you accept our Terms of Service and Privacy Policy . The "12-3-30" workout, otherwise known as the "hot girl workout" is the zombie exercise trend that's trying to suck the life out of your gym sessions. You may not even need a full 30 minutes, since 15 minutes of rucking can be a great entry-level workout.

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