About the gym classes
Each exercise is performed in a circuit training workout one after another with little to no rest in between exercises. Usually, there will be 8-10 exercises in a circuit, although this number can vary depending on how much time you have.
You can perform a certain number of reps for each exercise (8-20 reps), or you can time each exercise (30-60 seconds per exercise). Once you go through each exercise in the circuit, you can take a slightly longer rest (about 1 minute) to recover before beginning the circuit again. Repeat the circuit 1-3 times or for the duration of your allotted workout time