Try this 9 minute HIIT workout for your abs, obliques and serratus. Work up a huge sweat, burn tons of calories, torch fat and build muscle! - MrandMrsMuscle
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For the best fitness experience, play this workout in the Workout Trainer app with a connected smart watch or bluetooth heart rate monitor.
Do this workout with the best exercise equipment. We recommend using a bluetooth chest strap heart rate monitor or a smartwatch for more training optimization & performance tracking.
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