19-year-old Olympic skier's mind-boggling training exercise includes balancing, sliding, and flipping through an insane obstacle course

Olympic skiers obviously must have perfect balance, and Swiss freestyle skier Andri Ragettli has found a pretty good training method to test his balance.

The 19-year-old posted a video to Instagram showing an aspect of his training in which he does parkour through an insane obstacle course that includes exercise balls, slides, and balance beams.

The video begins with Ragettli jumping over a ledge and balancing on an exercise ball, which alone is a pretty amazing feat.

Andri Ragettli/Instagram

From there it gets harder - like running across a balance beam.

Andri Ragettli/Instagram

And sliding down a ramp on a plank.

Andri Ragettli/Instagram

And flipping on some rings.

Andri Ragettli/Instagram

The whole thing must be seen to be believed.