* Chair squat: Squat down in front of your chair without supporting yourself. Then lower slowly down so your bottom just touches the seat of the chair then come up again. Keeping the weight through your heels. Keep your head up.
* Chair or desk dips: Use either the edge or front of the chair to perform a dip. Make sure the chair is rigid and strong enough to undertake the exercise. Have your back facing the edge of the desk, arms bent. Have your legs out in front of you and your weight going through your hands. You dip down and then push up. Feeling it in your triceps.
* Press ups: Either perform normal press-ups on front of your desk or if you feel adventurous, put your feet on the chair and hands on the floor. This makes things harder.
