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.
Tips to know. 1  Most fan belts are made to last about 75,000 miles or five years, whichever one comes first. Most mechanics recommend you replace it every 30,000 to 40,000 miles. Even if you donât drive a lot, the heat can wear down on the rubber, breaking it down. The teeth of the belt, over time, can wear away as well.