How does it work? Well, you get a crazy big tire (like something from a tractor or one of those 'Monster Trucks' you see at those nutty truck shows) and a big that you can thrash up a little bit (like a back alley or a big backyard or a field), and just start flippin' !! The key here is to make sure the tire is heavy enough to give you a decent workout
How to do it? Just lie the tire on its side, bend over into a squat, hook your fingers under the tire and lift until the tire is on its treads, then push it over until it lands on its side again. Repeat... and repeat again... and again.
You get the idea. Just keep going until you are exhausted, and trust me, it won't be long until you are. It's a great full body workout.
Another cool way to get an alternative workout in is Rope Climbing. Of course you need to find a rope or two, but talk about a great full body workout. If you think this is just for arms and back you're sorely mistaken. You engage your full body to get yourself up those ropes. Go ahead and wrap your legs around that rope to help you get up there!!
Now, how about Stone Lifting? There's another crazy alternative way to get ripped. And you don't even have to pay for the equipment.
Head down to your local park or beach and find a huge and heavy stone and just start heaving it around.
Lift it over head like you would a barbell during shoulder presses, throw it and chase it, pick it up and throw it again. Use it to do some bicep curls. How about holding it while you so some squats or lunges? All great ways to use a heavy, misshapen stone in your workouts.
The idea is that it's an awkward shape which makes it harder to lift and gets more muscles fibers working to compensate for the awkwardness of the lift. It's a great way to not only get ripped but get your functional training in as well.
For the record, 'Functional Training' is great to just generally make living life easier. Want to get more groceries in from the car in one trip? Or pick your kid up and carry him around while you do a chore or cook dinner? This is what functional training can help you with. Life isn't lived with equal weights on each side for everything you do throughout life, and neither is functional training.
So flip some tires, climb some ropes and lift some stones. You'll get very fit very fast AND life chores will suddenly seem that much easier.