USA Ninja Challenge, which opened in May, offers activities that build confidence in a fun environment, the owners say.

The American Ninja Warrior-style training gym draws athletes of all ages, from kids looking for fun to adults chasing goals.

A full-time dad around the clock and a health care worker at UW Medical Center-Montlake by day, Hill had just returned from an intense weekend at Life Force Ninja, a Bellingham gym where he’s been ...