More exercises to do at your desk

As promised, here are some more exercises you can do at your desk while at work. As always, if any of these bother you, as in they really hurt to do, then please don't do them, but try another exercise.

Calves

1. While sitting, lift up your legs onto the balls of your feet and then release.
2. Continue until your legs and calves are tired.
3. Repeat every 10-15 minutes for an hour.
   

Leg

1. Holding abdominal muscles in, extend leg until it is level with hip.
2. Hold for a few seconds and then repeat with other leg.
   

Hips

1. While seated, lift one leg off the floor a few inches with knee bent.
2. Hold for a few seconds and then repeat with the other leg.