The TRX, one of the most popular, universal and easy to use exercise tools in the fitness industry today. The TRX is one of the most versatile and mobile devices designed to give you an effective and challenging body weight workout. If you have access to a TRX then here is a great video showcasing advanced TRX exercises and some fantastic metabolic circuits. The idea of the metabolic circuits is to get your heart rate, burn a bunch of calories and build strength as you are sucking wind working with the negative rest. A great way to amp up your workout, burn more fat and get your body moving.