Forward Neck Stretch
Key
Stretch your chin and head forward before bringing it down toward your chest.
Once your chin is at your chest, (or as close as it will go)
Hold the position.
You should feel a nice stretch in the back of your neck.
Check to see if your shoulders are hiked up. They they are, let them drop.
Breathing
Again, as you breathe out, your body relaxes and the stretch will increase.
With your chin in position near your chest:
Breathe out.
Let your chin follow your chest downward as much as possible.
To breathe in
Pause your movement. Hold your position.
Breathe in. Let your shoulders stay loose.
Breathing out, see if your chin will follow your chest downward any farther.
etc etc. until you know you've hit your limit.
At your limit, hold your position for 1 - 4 breaths.
To release
Reverse the movements that got you into the stretch. (That's a general rule for yoga.)