Trx training is translated as whole body resistance exercise. Simply put, it is a way to exercise with braces. Trx training is very popular now, and many stars love it. TRX uses its own weight as resistance to train your muscles by adjusting the different lengths of the rope. It was first invented by the U.S. Navy, with the purpose of enabling soldiers at sea to exercise wherever they are. TRX (total resistance exercise) suspension fitness system can help trainers complete almost all-body muscle training and improve strength, flexibility and core stability.