[airair]

http://www.lynnblakegolf.com/forum/thread2689.html

EXTENSOR ACTION assists in keeping the left arm straight as well as helping
maintain the structure of the power package and Flat Left Wrist at impact.
Generally Extensor Action is applied via pressure point #1, the heel pad under
your right thumb pressing against the first knuckle of your left hand. Here are 4
ways Homer Kelley says Extensor Action is important:
1) the full extension of the Left Arm at all times
2) the full extension of the Right Arm for the Follow-through
3) the correct rate of “Clubhead Closing”
4) the proper type of support for “passive” (non-accelerating 6-C-0)
Clubhead Lag Pressure involving Wristcock.
It is not a very strong pressure. Try putting a wind breaker on with your left arm
not in the sleeve. Use your right hand to grip the left sleeve just as though it
was a golf club. Keep the sleeve straight during a golf swing. That little bit of
tension is all it is.
Extensor Action is a huge key to the Golfing Machine and I don't see it
discussed very much in other teachers methodologies...
EXTENSOR ACTION should feel like an ounce that produces a ton of structure.