About isometrics-Basically there are three kinds of strength a person posseses.1)Eccentric, or lowering strength.2)Concentric, or lifting strength.3)Static, or holding strength.Isometrics fall under the category of static strength.An isometric contraction is pulling or pushing against an immovable object.If you are doing curls and on your fifth rep, you find that you can only raise the weight halfway up, this means that your concentric strength is temporarily depleted.By attempting to hold the weight in this position for a given period of time, say 5 seconds, you are doing a form of isometrics.There are many different ways of doing isometrics, with and without weights.I have used them with some success in the past, but you must have a good strength base to perform them correctly due to the intense nature of the contractions.A beginner who incorporates them into his training will most likely overtrain or become injured.I have also read that Bruce Lee used isometrics with great success.I believe that is one of the primary reasons why such a small man like Lee could overpower such larger opponents and perform so dynamically.
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