December 15, 2014 12:37 PM

Zach Harrison Photography

As a former U.S. Marine, Erin Oprea is dedicated to fitness. Now a Nashville-based personal trainer with clients like Carrie Underwood, she uses her expertise to help those with busy lives stay fit. Visit her site or follow her on Twitter @erinoprea. Then come back to PEOPLE.com every Monday to master a new workout move.

‘Tis the season for parties and, more importantly, party dresses.

Keep your core toned and your upper body strong with this one great move.

RELATED: Master This Move for Toned Hamstrings: Dead Lifts with a Stability Ball from Celebrity Trainer Erin Oprea

By swinging a foot forward, like Mr. Spiderman, you will engage your oblique abs and add a great twist to your push-ups!

Spiderman Pushups

Zach Harrison Photography

1. Start in the classic push-up position with your core engaged.

2. Bring your right knee toward your right elbow placing your foot down.

Zach Harrison Photography

3. Perform a push-up in this augmented position, then return to the starting form.

Zach Harrison Photography

4. Switch legs to repeat the maneuver on the other side.

5. Continue switching legs and performing push-ups for 10 to 20 total repetitions.

RELATED: Master this Move: Sumo Squat Side Hop from Celebrity Trainer Erin Oprea

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