What's the name of the machine with vibrating belt in the gym?

It's called "waist beauty machine"

Introduction:

The main body system of the waist-beautifying body completely matches the natural posture design of the human body, so that the chest, shoulders, waist, abdomen, buttocks, legs and other parts can achieve the exercise effect through natural swinging, especially for elbow, waist, abdomen, shoulders and neck relaxation and muscle exercise, which can achieve good results only by easy and natural swinging. The product occupies a small area (about 1 square meter) and is easy to fold and store.

Function:

Beautiful waist, massage and slimming, leisure and entertainment. It mainly plays an auxiliary role, and the effect depends on the user's personal state.