52 blocks pull up routine

A friend of mine sent me some “52 blocks” pullup fitness videos related to this one:

This dude is crazy:

More on the gyroscope-like mechanism for balance

More on the gyroscope-like mechanism that helps us keep our balance:
The inner ear functions like a gyroscope. Three orthogonally oriented structures, called the semicircular canals, sense the orientation of the head via movement of fluid within the canals. Nerves connected to these structures send a train of neural signals to the brain, which integrates that [...]