Forget the days of dozing off on your textbook—trainer Kaisa Keranen shows you how to exercise with it instead.

By Lauren Mazzo

Remember when you thought that sleeping on your textbook like a pillow would magically make the knowledge seep into your brain? You probably realized by now that's not going to do anything besides maybe leave a red mark on your forehead. But planking on top of your textbook will give you a ton of benefits-at least for your body.

ICYMI, Tabata queen Kaisa Keranen (a.k.a. @kaisafit and the creator of our 30-day Tabata workout challenge) is breaking the internet with her household item-infused workouts. She started with a toilet paper workout, mastered the pillow workout, and has moved on to using a textbook to ignite a body-not brain-burn.

How it works: Grab a thick, hardcover textbook and follow the usual Tabata protocol: 20 seconds of as many reps as possible (AMRAP) and 10 seconds of rest. Cycle through these four moves twice for a quickie 4-minute workout that packs a serious punch. Repeat for an even longer, more intense workout. One thing's for sure: If you're not dying by the end of those 20 seconds, you're not going hard enough. Sorry, but you gotta push your limits to see those results.

Single-Arm Sliding Push-Up

A. Start in high plank position with a textbook under your right hand and feet wide.

B. Lower into a push-up as you sliding textbook forward, keeping core tight and hips even.

C. Press back up to starting position, sliding textbook back under your right shoulder.

Do AMRAP for 20 seconds; rest for 10 seconds. Do every other set on the opposite side.

Sliding Split

A. Start standing with feet together, textbook under your right food. Fold forward, placing hands on the floor, bending right leg as needed and lifting heel off the textbook.

B. Slide right foot backward with toes still on the textbook and knee slightly bent, keeping left foot and hands on the floor to drop into a split.

C. Engage core and lift hips to slide textbook back up to starting position.

Do AMRAP for 20 seconds; rest for 10 seconds. Do every other set on the opposite side.

Sliding Single-Leg Push-Up

A. Start in high plank position with your right foot on a textbook and your left leg lifted.

B. Lower into a push-up, extending left leg as high as possible.

C. Push away from the floor to return to start, and draw knees in towards chest, right foot sliding textbook forward and left leg still hovering off the ground.

D. Slide right foot back out, lift left leg, and lower into a push-up to begin the next rep.

Do AMRAP for 20 seconds; rest for 10 seconds. Do every other set on the opposite side.

Plank Slide to Push-Up

A. Start folded forward with feet hip-width apart and hands resting on a textbook.

B. With straight arms, slide textbook forward to a high plank position.

C. Do a push-up, then slide textbook back in toward feet.

Do AMRAP for 20 seconds; rest for 10 seconds.

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