An Isometric Exercise
No doubt it is vitally important abdominal exercise in order to have adequate supporting musculature. But injuries or diseases of the spine and is restricting many movements where very useful exercise your abdominals isometrically.
An isometric exercise is one in which a muscle contracts without movement. In other words, in an isometric abdominal, our muscles will be working to maintain posture.
In this position you must hold your position, trying to relax the arms and shoulders that tend to tense up. A set time will vary greatly depending on what you are trained, from short series of about 20 seconds to two minutes even beginners to very advanced in people.
While it sounds simple being at work without moving a muscle, do not be fooled. To be made throughout the time series, there is no eccentric phase where the same relaxation. In other words there is no rest, making the exercise extremely intense.
This is in essence a very good alternative for people with back pain, weakened inter vertebral discs and other spinal diseases and need to run it to strengthen an area very important for health.