Tribulus terrestris is the #1 selling testosterone booster, and the best example of a supplement that increases libido, but has no effect on testosterone.
Ab belts may cause muscle contractions if used properly. But the belt alone cannot produce six-pack abs. The real challenge to ab definition is the layer of fat that lies right under the skin, hiding muscle tone.
1 Flex-Weave Cover â The Gates B69 v-belt is a wrapped belt that features a patented single layer fabric construction for longer cover life. 2  The cover protects the belt core from oil dirt and heat. 3  The wrapped cover also makes the belt suitable for clutching applications.