Gunbarrel girls tackle obstacles one at a time

Three Gunbarrel kids are tackling obstacles, but not out of necessity. They’re doing it for fun.

The three Heinrichs girls—Anabella (14), her sister Secorra (11), and cousin Sorenne (9)—are all Junior American Ninja Warriors. They run, balance, jump, hang, scramble, climb, fall, get up and do it over and over again, simply because they love it.

Based on a Japanese show, American Ninja Warrior is a...