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.