What is the importance of warming up and stretching prior to starting any exercise activity?

Performing a warm-up and stretching routine is a vital component of overall good health and fitness, and is strongly recommended before and after each and every strenuous weight training workout (or any other exercise routine for that matter).

Explanation:

One of the most important physical benefits of warming up before exercise is elevated body temperature, which helps improves calorie burning, thus giving more fruitful results of exercising. A warm-up improves the flow of blood through the tissues, and results in greater muscle flexibility.

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which ever one is showing doing the same exercise in time intervals such as 30 seconds or a minute several times.