In the past, I belonged to a woman's only gym called Curves, that uses circuit training where you use a machine for 30-45 seconds and then move to the next machine in line. There were bounce boxes (similar to trampoline) in the circuit to allow for aerobic activity. It was an insane, calorie burning workout. I loved it so much. I'd love to join a gym like that again, if they have one in my area. So much better than a regular gym and I was never bored.
Do you go to the gym? If so, what's your favorite gym workout?