Belt it out: A weight training lifting belt can be used to protect your back during heavy, standing lifts. Don't keep it cinched tight between strength training lifts, as it can raise your blood pressure. (Check with your doctor before doing heavy lifts if you have high blood pressure.)
In most cases, using a belt all the time will keep your back muscles from getting stronger, so they are a specific strength training exercise tool. Don't be one of those people you see walking around the gym with a weight belt permanently on. Plus, they don't go with your general wardrobe.