Are you 18 years old or above?
Go behind the scenes with Jack Sock to see what the American is working on during the off-season and hear what his goals are for the 2017 season.
![[4K] American Ninja Warrior Season 16 Episode 7 Semifinals 3 & 4 Part 1](https://img.long.tv/short/2024/11/JvHyOmZ-4ec.jpg)
