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This equipment-free workout fromWell + Goodgoes by lightning fast.

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Now, shes bringing her passion for fitness to a wider audience with her new book15 Minutes to Fit.

In it, Light shares a 30-day workout program, along with her personal fitness and nutrition tips.

The next time you do the workout?

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make a run at get more reps into that same time span.

You arent going to hit a plateau because youre constantly competing with [yourself], says Light.

Youre always pushing against your personal best.

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Meaning that you really can do them anywhere (sorry, excuses).

Ready totry one of Lights 15-minute workoutsfor yourself?

Complete each exercise in order for the specified number of reps.

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Complete as many rounds as possible in 15 minutes.

High Knees

Start in a standing position with your feet hip-width distance apart.

Keep your chest lifted throughout the movement and land on the ball of your foot.

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Complete 20 reps.

Everest Climber

Start in a plank position with your hands under your shoulders.

Step your left foot forward next to your left hand.

Then, jump up to switch legs.

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Land with your right foot forward next to your right hand and your left foot back at starting position.

Continue to jump-switch your legs and complete 20 reps (left and right).

To modify this exercise, do mountain climbers.

Return your right foot to starting position.

Switch legs and bring your left knee to your chest.

Push off the ground to pop up.

Land in a wide stance with your body and toes facing left like youre on a surfboard.

Bend your knees and lower your hips toward a squat.

Drop down to your belly and pop-up again, this time facing the other side.

Complete 20 reps (left and right).

Competition Burpee Jump Tuck

Start in a standing position with your feet hip-width distance apart.

Squat down, bringing your hands to the mat and jump back to plank position.

Drop down your whole body to the floor.

Immediately do a tuck jump, where you jump up and tuck your knees into your chest.

Land softly for one rep. Place your right hand on the ground in front of you and your left hand behind your head.

Be careful not to pull your head with your hand.

Complete 10 reps and then switch sides.