Here are some more great exercises for confined spaces to help your body from getting too stiff:

For the Neck:

1) Sit up tall in your seat.
Tilt your head slightly to one side. (You want to feel a gentle stretch not a strain.)
Focus on tilting your ear to the shoulder, not your cheek to the shoulder.
Hold for a count of 10.
Repeat other side.

2) Turn your head to one Side
Tip your chin as if you were looking at your shoulder. (Again, you want to feel a gentle stretch not a strain.)
Hold for a count of 10.
Repeat other side.

Check back tomorrow for more exercises you can take with you whenever you travel.