Small exercises : perform at work, remain active

Sitting / standing at work for long time, in single position, can hurt our bodies lot more than a small accident may do ! It's better to keep moving, take short breaks (1-2 minutes) frequently, to avoid any greater injuries to muscles & bones.
Here are few exercises listed, along with my illustrations, & instructions on how to perform them. I do them whenever possible :

General instructions :

1. Get up from your desk / work place once every 5 minuets .
   
2. Perform just 1 of these exercises in a break - it takes a minute. Next break would be for next one.
3. Once complete, the cycle repeats.
4. Perform each of these for 10 seconds each & don't jerk your body parts in any of the exercises.
5. Treat your body gently.

Exercises :
1) Head tilt :