It teaches you about oral stability in movement. On the log everything movement wise, is the opposite of the direction your mechanics are taking...
First guy I ever saw using the philly shell, Yoda rated him the best. Pal of mine wrote Black murderes row worth a read.
Its related to any sport, where there is movement. Basic fundamentals of movement.
Think, sensory perception.
No, its the movement.
Watch top Sprinters, do their heels touch the ground.
Its staring you in the face, cant think of anything else what does it so efficient.
I thought like that 50 years ago, the log is fine tuning, not for the injured.
I know that, want to know if anyone can see it.
Lots of intelligent people didnt get it at first, see if you can. :D
wrong :D .
Is that a dont know :D. .
All movement does, plus it helps to prevent injuries, so whats happening on the log.