Electric Full Body Massager

Functionality: These machines provide rapid vibrations that cause muscles to contract and relax multiple times per second, potentially enhancing workouts and offering benefits like increased muscle strength, improved circulation, and better balance. 

Features: Many models, like the one shown, offer adjustable intensity levels and various programs to target different muscle groups. Some also include resistance cords or power grips for upper body workouts. 

Availability: You can find these devices at some gyms or purchase them for home use from various retailers like Amazon. 

Considerations: Before using a vibration plate, especially if you have existing health conditions, are pregnant, or recovering from surgery, it's advisable to consult with a healthcare professional.