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Sit up straight in your chair, keep your knees together, and lift one leg at a time, holding it parallel to the floor for a few seconds before lowering. Repeat with the other leg. It engages the lower abs and strengthens your core.
Sit on the edge of your chair, lean back slightly, and place your hands on the sides of the chair for support. Bring both knees toward your chest, hold for a second, then extend them straight. It targets the lower belly muscles.
Sit up straight, cross your arms over your chest, and twist your torso to the right, hold for a second, then twist to the left. It strengthens the oblique muscles on the sides of your waist.
While sitting upright, place your hands behind your head. Engage your core and lean forward as if you're trying to bring your chest to your thighs. Sit back up and repeat. This exercise works the upper and middle abdominal muscles.
Extend your legs out straight under the desk. Reach down with one hand and try to touch the opposite foot, then switch sides. It engages your core and helps improve flexibility.
Sit on the edge of your chair with your hands gripping the sides for balance. Lift your legs and move them in a circular motion as if you're pedalling a bicycle. It targets the entire core while also engaging your legs.
Sit straight and exhale fully. Now suck your belly in as if trying to touch your navel to your spine. Hold for 5-10 seconds, then relax. It strengthens the core and improves posture.