Most physicians use the jar opening test to determine health.
I remember my first pickle jar when I was a young teen. The doc hands me the jar and says, “Open it, kid.”
I did and I got my clean bill of health to play football.
And then coach put us through hell. Not the tackling dummies, not the sled, not the car tires, but the dreaded “pickle jar run.” 10 seconds only to go 40 yards and open 2 pickle jars for each 10 yards.
It made 250 pound linemen cry.
Fortunately, they got to eat the pickles, so that helped a little bit.