Of all of the types of exercise that people can do today, trampolines are one of the best ways to get an enjoyable, relaxing aerobic workout. For almost a century, trampolines have been used in a wide variety of both competitive and recreational settings, from the Olympic Games to the backyards and homes of the average citizen. It's a simple idea, really: a typical trampoline is merely a taut piece of fabric that has been stretched over a well-built support casing. Of course, this isn't enough to supply any great amount of propulsion; in order to get sufficient rebound potential, the fabric has to be attached to the frame with springs. This way, the trampoline has enough give to be flexible, while maintaining the support needed for jumping.
The first trampoline was invented in the 1930's, although there have been trampoline-like contraptions in use dating back at least several centuries - these consisted of only a blanket and many people standing in a circle, but the basic principle is still the same. It is even said that the Inuits used walrus skin to achieve the same effect. By the early 1940's, trampolines were being mass-produced and looked much as they do in modern times.
Today, trampolines can be found in many homes due to the low-impact nature of jumping on one (its flexibility puts less stress on one's knees than most other types of exercise involving the legs). The smaller type of trampoline that is usually found in these homes is generally referred to as a mini-trampoline; the larger ones, such as those that can be found in gyms and in backyards around the world, are higher off the ground and can launch a person up to 10 meters in the air (and therefore require a safe environment, clear from obstructions and other high-commotion areas.)
Whichever style you prefer, trampolines are a great way to get those kids (or yourself!) up off those derrieres and enjoy the outdoors, or with a mini-trampoline in the living room, you don't even have to interrupt television time to keep your kids active and smiling. It's important, of course, to never allow children to play on a trampoline unsupervised, and everyone who uses one should take care to wear shoes that won't slip. As with any form of physical activity, it's best to warm up for a few minutes before thoroughly working your muscles. An easy way to do this on a trampoline is to simply lift your heels repeatedly, bouncing softly and letting your natural motion lift you slightly in the air. (Once you've got your blood flowing, try lifting your knees and jogging in place. Careful - on a large trampoline, it's not so easy as it sounds!)
Carelessness leads to unnecessary harm all the time; tens of thousands of injuries every year are attributed to home trampoline use. However, with proper maintenance and an eye on safety, it's easy to use trampolines as a secure, enjoyable activity for all.
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