A TRX class is a fitness class that utilizes a suspension training system called TRX, which stands for Total Resistance Exercise. The TRX system consists of adjustable straps that can be attached to an anchor point, and the user's body weight is used as resistance for a variety of exercises that target multiple muscle groups. In a TRX class, participants are typically guided through a series of exercises, such as squats, lunges, planks, and rows, while adjusting the intensity and difficulty of the exercises by changing the angle of their body or the length of the straps. TRX classes can be adapted to different fitness levels and goals, making them a popular option for people of all fitness backgrounds.