HOW: Lift your feet so they don’t touch the ground and tense your abs at the same time. Also try to lift your thighs slightly off the chair. Keep your feet elevated for as long as you can manage. Rest & repeat.
The great thing about this workout is that it’s very discreet and and you can do it pretty much everywhere when sitting down. Try it the next time you are in a meeting or just working in front of your desk.
At first it will feel easy but after a while your will feel that this is an effective exercise. Don’t forget to keep your abs tensed. It’s the key!