Support WBURIn 'Minding The Gap,' Skateboarding Is The Least Of The PainPlay07:24Download AudioMelissa BlockSophia Alvarez BoydEd McNultySeptember 02, 2018 ShareIn Minding the Gap, filmmaker Bing Liu uses old and new footage of his skateboarder friends Keire Johnson (left) and Zack Mulligan (right) to track the turbulent upbringings and present-day struggles of all three. (Hulu)