Last night I happened to see a television advertisement for "Joint Juice" featuring Joe Montana ... hang gliding!!
I don't know how long this has been out, but it was a cute ad. The commercial starts off with Joe introducing the product:
Then they show Joe running, bicycling, running up stairs, playing ping pong, fencing, and doing some extreme gardening:
Then they show a short clip of Joe Montana ... hang gliding:
That's about as far as Joe will go because the next sequence shows Joe preparing to ride a bull:
That's where Joe draws the line. After sizing up the bull, Joe says "I don't think so". The commercial finishes up with Joe endorsing the product.
Sorry about the quality of these snapshots. I happened to capture the ad on VHS ... running in 6-hour mode. If you've got any more information on the ad, please post. The hang gliding shots look like they could be from Joe Greblo's school at Dockweiler Beach near LAX, but the clips are shot from an angle that's hard to tell.
Update August 21, 2020: YouTube version: