Tire Flip Tutorial: Using the knee.

CF Tutorial on Tire Flip Technique by Rob Orlando.

Along with lunges, tire flips are another movement that are often times entertaining to watch people perform. I would say if they can't lunge properly, it's likely that what you'll see is a back and bicep muscle tire flip, probably similar to how the Neanderthals attempted to move a stone wheel. The reason is they don't have a clue how to use their hips or are too inflexible to use the hips to generate power. If a herniated disc or torn biceps brachii is your goal, continue on with back/bicep muscle flips. Also keep in mind if the tire comes back at you because you aren't getting enough power behind it and you catch it with the foot in plantarflexion, you'll likely tear the achilles tendon as well. To quote Winston Wolfe, "if self-perservation is an instinct you possess", I'd suggest watching this video.

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