While rock climbing last night, these guys caught my attention doing a test of stretching and balance.

The idea is to keep your feet behind the line and walk your arms out using only 2 bottles while not touching your body to the ground.
While keeping balanced on one bottle, (yellow bottle in this case) you stretch one arm out and push the other bottle (green) as far as you can.
The hard thing is, you still have to get back to standing position, again without your feet going over the line or your body touching down.
This picture was taken during the return to standing position.

Another shot below:
-M@!