You might start on the boxing section, during which the instructor and TVs on one side of the room will tell you to cycle through different sets of boxing moves, such as ducks and upper cuts. From there, you’ll move to strength training, where you’ll do as many sets as you can of moves such as squats, lunges, and mountain climbers. On the treadmill, you have some options. If you’re a runner, instructors will ask you to alternate between three different levels: a jog pace, a run pace, and a sprint pace. For people who want to walk, you’ll increase your incline throughout class instead of the speed. (They have a guide for how to change the settings, in case you miss something.) They also have a bike in one corner, for people who prefer that for their joints.