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Planks are a great core workout, but you don’t always want to touch the floor on all fours – especially in the office. Keep just your two feet planted on the ground for this great upright exercise.

1. Start facing left, with your feet parallel to and roughly two feet from the wall. Place your right forearm on the wall, but keep your body perpendicular to it, with your right hand pointing toward the ceiling. Come up onto your toes. 2. Keep your left shoulder in line with your left hip as you rotate your body toward the wall. Finish in a front-plank position with both forearms on the wall. Hold for five seconds, then rotate back to the starting position. Try two or three controlled repetitions. Then switch and repeat on your left arm.

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