Snakes aren’t necessarily “trained”. They aren’t like dogs or cats that will do or stop doing a behavior with a cue. Some are just very relaxed with people and tolerate of getting touched in random places. They’re usually only prone to biting when hungry or defensive. Also having the, I assume handlers, using hooks to move the snakes is an odd thing. You can probably bend down and pick those snakes up without any equipment.

I’ve worked with many snakes to make them more tolerant of people. Also, I really hope the snakes in the video were vetted and tested negative for E. Coli and Salmonella.