You could say it started off as a gag, an inside joke, a way to (funnily) optimize time on the course. Steven Schnobrich, now 23, wanted to make a “golf cart punching bag” for him and his uncle.

Growl’s interactive bag lets you punch your boxing trainer in the face. Growl says it will upgrade the punching bag in 2025 with projectors, hit sensors, and motion tracking for real-time ...