Justin Cranmer is an ANW competitor from St. Louis. Cranmer has currently competed three times on American Ninja Warrior, but has since competed alongside his brother, Kevin Cranmer, starting from American Ninja Warrior 9.
After missing out on season 8, Cranmer returned on American Ninja Warrior 9 in Kansas City, alongside his brother Kevin. Justin's run was once again cut, but he failed Crank It Up and was not fast enough to make the top 30. However, it was was shown over the broadcast he completed the Broken Pipes by skipping over the middle section.
Cranmer once again competed alongside his brother in Minneapolis. His run was cut again, but he fell on the Battering Ram. However, for the first time, Justin made the top 30, placing 20th overall.
In the city finals, his run was cut once again, but it was revealed that he failed the Archer Steps. Between all six city finals courses and all four victims that fell on the obstacle that season, he was the only male competitor to have done so.