As a former U.S. Marine, Erin Oprea is dedicated to fitness. Now a Nashville-based personal trainer with clients likeCarrie Underwood, she uses her expertise to help those with busy lives stay fit. Visither siteor follow her on Twitter@erinoprea. Then come back toPEOPLE.comevery Thursday to master a new workout move.

Mixing isometric exercises with weight training is part of why training makes me happy: I love combining the best of different worlds to create strong bodies in myself and all of my clients.

Holding a plank while performing front raises is a perfect example of this and it creates a very challenging position that everyone should strive to complete.

Plank Front Raises

Erin Oprea

1.Grab a light dumb bell and get yourself into a plank on your hands with the weight resting right near you.

2.Making sure to engage your core very tightly and keeping your feet a little wider than your usual plank form, grab the dumb bell with your right hand.

Erin Oprea

3.Extend your right arm straight ahead while maintaining your hips square to the ground.

4.Return to the starting position and repeat 8-12 times before switching arms for more fun!

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source: people.com