Isaac Caldiero is a former busboy and professional rock climber from Las Vegas, Nevada (Formerly from Orem, Utah). He considers himself one of the best rock climbers in America and one of the best in the world. He is best known for living a nomadic life, even stating he's never lived on a salary higher than $10,000. He frequently lives in either an RV or a van with his girlfriend and fellow competitor Laura Kisana.

American Ninja Warrior 5

In Season 5, he walked on in Denver dressed up in a Jesus costume and completed both the qualifying and the finals rounds. In Vegas, he completed the first three obstacles and stuck the mount on the Jumping Spider, but he couldn't lock in properly and slid down into the water, ending his run.

American Ninja Warrior 6

In American Ninja Warrior 6, he competed again in Denver and once again completed the qualifying and finals round. Caldiero exacted his revenge on the Jumping Spider and completed the Stage One with a little bit of showboating. However, he failed the Double Salmon Ladder in the Stage Two, despite training on it on the replica course he built in his parents' backyard. Out of all of the members of the Wolf Pack, he performed the worst in this tournament.

American Ninja Warrior 7

Isaac returned for American Ninja Warrior 7 where he competed in Kansas City. He completed the qualifying course, again showboating. In the finals, he got through the obstacles in a more serious tone, but due to the torrential rain he fell on the newly modified Body Prop. He still qualified for Vegas, finishing in 4th place.

In Vegas he completed Stage One, going on to defeat the Double Salmon Ladder and completing Stage Two. In Stage Three, Caldiero put on an incredible performance, and cleared Stage Three for the first time. Soon after Geoff Britten followed suit by completing Stage Three as well.

Since Caldiero had the fastest time on completing Stage Three than Britten, he decided the order of attempting Stage Four, he decided to went last on Stage Four. Britten made a valiant attempt on Stage Four by ascending the tower in 29.7 seconds and completing the first ascent. Caldiero then went on to complete the tower in 26.14 seconds, astoundingly becoming the first American Grand Champion.

Due to the fact that American Ninja Warrior's rules only allow the fastest Kanzenseiha to "win", Caldiero won the $1,000,000 prize and the title of First American Ninja Warrior Champion.

He is a competitor for Team USA in the third American Ninja Warrior International Tournament in which Team USA won the tournament. Ever since his total victory, he quit in being a busboy and is now living in Las Vegas, Nevada.


Following his great season, Isaac retired from American Ninja Warrior altogether, as stated on the Wolf Pack Podcast. However, starting from American Ninja Warrior 8, Caldiero is working with POM Wonderful, where one lucky member can win a trip to work out with him. He was advertised on every broadcast in Season 8.

It was revealed that he would make a return to Ninja Warrior by participating in the celebrity special of Ninja Warrior Germany last November 2017.

Also, he attempted on KuroOvi, the show that seeks to find an “Ultimate Hero” on a timed course that’s 123 meters long, with 12 obstacles. The obstacles all have a city theme to them, and there’s math involved. He failed on the fourth obstacle called 'Brain Panic', which is similar to Parley which was used in VIKING (not to be confused with Brain Panic which was an event in Kinniku Banzuke).

ANW Result Notes
5 Failed Jumping Spider (First Stage) Had no traction.
6 Failed Double Salmon Ladder (Second Stage)
7 Kanzenseiha (3.86 seconds left) Completed the final stage in a faster time than fellow Finalist Britten who completed it previously.