Lylah MacCall

Lylah MacCall is getting a serious head start with her training for "American Ninja Warrior."

She is 5.

Her dad, Gavin, helped by building an amazing obstacle course in the family's backyard in Colorado. It took several months to build, and Lylah was ready to crush it:

Lylah's interest in "American Ninja Warrior" began in August 2015, and Gavin's first course was a bit more modest: