We stayed inside an American Ninja Warrior gym after closing hours and spent the night there!! We slept in the foam pit, and it was actually quite comfy!

Are makeshift ninja warrior gyms a common sight in ... Start them early with the Little Roamers & Me class at this Mount ...

A ninja gym here is now open throughout the year, offering hands-on training experience in "shuriken" throwing, gunnery and other skills. The city is known as home to the Iga ninja clan ...

Wood engraver Yuichi Niino, 40, opened the first ninja "dojo" gym in the prefecture in the former Kumagawa-juku post station here on Jan. 24 along with real-life ninja master Daisuke Nishiura.