in the vid they said they were exercises used to develop agility, balance, speed, flexibility.
i also noticed they were high altitude training (mountains) though the trees would have provided more oxygen.
it looked like a relaxing place to train. peaceful. they seemed to be smiling and enjoying the tasks, too.
i guess there are general 'athletic' attributes that most athletes would profit from irrespective of sports.
maybe like how (fairly controversially) there is domain general and domain specific intelligence. it would make sense that there is domain general and domain specific athletic ability.
but yeah, a lot of stuff on exercise fairly generally is crap. core training, functional fitness, general physical preparedness etc. guess there are good ideas behind the notions but people end up perverting them, rather.