LOL...this guy should not be making videos. He sounds like a moron and it looks like the first time he's ever swung a sledge hammer. I do this several times a week and it's a great addition to a workout. You should really learn to plant your feet and swivel your hips like you're throwing a proper punch when you swing, though. The way he steps around back and forth ruins a lot of his power and fluidity.
Also, depending on the size of your tire, there are some great ways to mix it up. With a tractor tire, you could flip it over between sets or do burpees with a jump up onto the tire. "Box" jumps also work, and get the heart rate way up. Plank walks with your feet on the tire are also challenging. With a smaller tire, you can pick it up and do a clean and press, or do side to side hops over it. Oh, and most mace ball or club bell moves can also be done with a sledgehammer. You can very easily come up with an entire workout with a sledgehammer and a tire.