image of obi amrine from usa ninja challenge franchise San Diego County
Franchisee Stories

Marine Corps Veteran and Husband Bring USA Ninja Challenge to Poway, California, to Get San Diego Kids Moving

After two decades in the Marines and years in corporate roles, Obi and Mark Amrine found franchising with USA Ninja Challenge offered flexibility, family focus and a lasting legacy.

By Victoria CampisiStaff Writer
1:00 PM • 10/29/25

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