If shikos are the primary lower body exercise of sumo wrestling, then teppo drills are the primary fundamental upper body exercise.
There are plenty of variations of how one utilizes the structure but its meant to built timing and condition the body for contact.
Every sumo stable has one of these teppo poles in the corner but one can get a similar workout on a light pole or a tree (just be careful of splinters if you do 😆).
Strike with violent intention.
But strike with impeccable precision.
(videos via sumo(dot)training(dot)studio on IG)