While you could just loop the webbing strap under the tire, the strap will soon wear out as you drag the tire along the ground. You may either hold the strap in your hands or fix it to a strong waist belt. Or you could just go BFit style and use two sledgehammers and get even more muscles groups working…such as your core and forearms.
Drag your tire on gravel or grass for an easy workout or on concrete or uphill for a more demanding workout. To make your tire heavier, place a wooden board inside and weigh it down with weight plates, rocks or sandbags.