double sided toothed belt

Abdominal belts, often referred to as waist trimmers or abdominal toning belts, generally function by applying heat and pressure to the core area. The idea is that by wearing the belt during physical activity, one can increase sweat production in the midsection, leading to temporary water weight loss and a perceived reduction in waist size. Some belts also come with electronic stimulation features that promise muscle toning through electrical impulses.


...

The serpentine belt is designed to drive several peripheral devices in the engine, including the alternator, power steering pump, water pump, air conditioning compressor, and more. Unlike the older vehicles that used multiple belts to connect these components, the serpentine belt provides a single, continuous loop that simplifies the design and improves reliability. The design was introduced to reduce engine noise and minimize the chances of belt failure.


...