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Warming up before starting training session sessions is always necessary. A proper warm-up way raises your heartrate, range of motion, circulation, and neural drive on the working muscles. Benefits of starting to warm up tend to be than merely loosen stiff muscles. When exercisers do it carefully, it may actually improve their performance. On the other hand, an improper warm-up, or perhaps no warm-up whatsoever, can greatly raise your risk of injury from starting exercise activities. For wild animals, showing teeth doesn't imply smiles on the camera and photographers. The only reason for their exposing teeth is because face-up with brutal situation leading to battles for food, dating mate and territory. These fightings are always very intense but it shows how nature occasionally works and indicates view of cruel life.