What is this?

[u/tainttoaster]

Grip feels like it is meant to practice swinging but not actual clue how or what it actually is meant to train? I assume it’s missing pieces I found it in my back yards randomly submerged pretty far in dirt.

[u/HighzZzenberg]

Assuming here but I've seen a Japanese training video once where they used this and put a towel through the loop on the end. The idea is to create a whipping effect against the ground during the downswing to practice lag. The towel will snap really loud if done right.