I've been on the hunt for a good workout that can be done at home with the least amount of equipment possible, and I think I've found it. Welcome to the world of kettlebells.
Kettlebells originated in Russia a loooong time ago (1700's) but only recently gained popularity in the states. The main benefit that they offer that regular dumbbells do not is their ability to be swung. The fact that the center of mass of a kettlebell extends beyond the user's hand means that more muscles are utilized in controlling its movement as compared to the lifting of a dumbbell.
If you are interested in seeing what kettlebell exercises look like, I recommend checking out Lauren's blog. Lauren is a personal trainer that specializes in kettlebell workouts and has several videos available to view from her site and youtube channel.
I've already started doing her "Quick Fat Burning Kettlebell Workout" and have been pleased with it so far.