The Seat Toner

• Your office chair can be a piece of workout equipment when it comes to your abs. You'll probably never achieve a six pack simply by doing this, but if you're on your way, it's a fantastic way to keep the abs toned without putting forth much effort at all. Sit in your chair with your back perfectly straight. Tighten your ab muscles and hold while you count to 10. Breathe out as you release the tension. Repeat 20 to 30 times. Do this several times throughout the day.
  
  

Leg Pull-Ups

• This ab exercise is most often done with a weight bench in a gym or at home but can be transformed easily into an office exercise. The important thing is to find a chair that doesn't have wheels. If you can't find a chair without wheels, find one where the wheels can be locked. In order to provide extra support, it helps to push the chair up against a wall. Sit with your buttocks on the edge of the seat and support yourself with your arms holding the edge of the chair. Stretch your legs out in front of you, keeping them off the floor, and slowly bend your knees and bring them back toward your stomach before stretching the legs out again. Do this 10 times at various intervals throughout the day. If possible, this can also be done by sitting on the edge of a desk.
  
  

Ab Twists

• Ab twists can be done while sitting at your desk reading e-mails or talking on a cordless phone device. Sit up straight in your chair and press your palms together directly in front of your chest. Keep your knees together and your hips bent slightly forward as you twist your torso back and forth as far as you can before it becomes too uncomfortable. Don't twist beyond the point of discomfort.
  
  

Torso Pull

• The torso pull may be a bit of a misnomer because you're required to push and pull, but there is no doubt this is an effective office exercise for the abs. Although the exercise may sound simplistic, after just a few reps it becomes obvious how effective it can be. Sit straight up in the chair close to the edge of the seat and with your feet planted firmly on the ground. Stretch your arms straight out in front of you. Slowly bend backward at the waist as far as you can get before touching the back of the seat, hold for a count of 3, and then return to the starting position.