The abdominal squeeze: All you have to do is sit on the edge of your office chair with your feet flat on the floor. Then with your spine straight, pull in your stomach as much as you can and hold the squeeze.
The elbow to knee: Begin by raising your left arm overhead and then lifting your right knee into the air while bringing your left elbow down and across your body toward your knee. Repeat on the opposite side.
The seated oblique twist: Place a pointer stick, ruler or broom stick across your upper back and shoulders. It’s held with your elbows bent at your sides, palms forward. Sit up tall on the edge of your chair with your knees bent and feet on the floor. You can also bend your elbows and place palms on top of your shoulders to do the exercise without the stick. Simply rotating your spine from side-to-side is all you need to do for the exercise, though it is important to keep your abs tight as in the abdominal squeeze exercise. You can also rotate to one direction and then back to center first before working the other side.
Aim for 10- 15 repetitions 3- 5 times!