Isometric exercise.
Isometric is a type of anaerobic exercise in which the muscle contracts and opposes the maximum possible resistance that can cope  with for about ten to fifteen seconds, before it
returns
to a relaxing state. The important principle in isometric exercise is that the muscle is I constant train and not in an on and off state. In other words, isometric exercise may seem to be more static rather than dynamic but on the other hand, it is more “condensed” in terms of activity.
Any isotonic exercise, like weight training, pushups or pull-ups, can turn to isometric, if a rep is stopped in an active position, when the muscles are fully loaded and contracted. For instance, if you perform lateral raise in a dumbbell exercise and you “freeze” your movement, while being in the extension position, you start doing isometric exercise. Another good example is to lie in a horizontal position with the palms facing downwards. As soon as you raise the extended legs five or ten centimeters from the surface you lie on and stay still, you perform a difficult isometric exercise. Before you start an isometric exercise, take a deep breath and exhale gradually and slowly during the seconds the exercise lasts. Isometric training requirements are very limited in terms of equipment. Things of everyday use, like a towel, a heavy bag, a doorframe or even a wall, can be useful with a bit of imagination. A small set of weights and dumbbells can help, as well.
The most popular isometric trainer device is called "Bullworker". This is a combination of two chrome cylinders and a resistance spring. On the external edges of these cylinders there are handles which are connected with two strong thick straps.
Although “Bullworker” has been the first such a product introduced, there are numerous of similar devices in the market. Their length is about thirty five inches and the weight does not exceed the three pounds.
In general, isometric exercise is not very popular, because of its static nature. A trainee may find it quite boring, since it doesn’t give the sensation of action as, for instance isotonic weight training does. However, isometric exercise is considered very effective and can result in impressive improvement of muscular volume.
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