Growing up as a cheerleader, I never had to go to a "gym" to workout. All the tumbling and stunting we did at practice worked every muscle, even muscles we didn't know we had. Now, I struggle trying to motivate myself to go to a "gym" and get on a treadmill. A treadmill is not my style. I like fun workouts!
Last year, I discovered Zumba and fell in love. Dancing for an hour was a great, enjoyable workout for me. I also occasionally do the workout below. I guess you should do it multiple times to get an even better workout, but doing it once at least makes me feel like I got some form of workout in my day. I often increase the reps for more challenge.