An isometric exercise is a form of exercise involving the static contraction of a muscle without any visible movement in the angle of the joint. The term "isometric" combines the Greek words "Isos" (equal) and "metria" (measuring), meaning that in these exercises the length of the muscle and the angle of the joint do not change, though contraction strength may be varied. This is in contrast to isotonic contractions, in which the contraction strength does not change, though the muscle length and joint angle do. Books about isometrics  Ilse Buck, Gesund und schlank durch Isometrik, Auflage. Goldmann, München 1976, (). Lothar M. Kirsch, Isometrisches Training. Übungen für Muskelkraft und Entspannung. Falken Verlag, Niedernhausen im Taunus 1990, (). Theodor Hettinger, Isometrisches Muskeltraining. 6. Auflage. ecomed, Landsberg am Lech 1993, (). Victor Obeck, Isometric. Neu übersetzte Auflage. Scherz, Bern 1980, OCLC 164662767 (anglais: How to Exercise Without Moving a Muscle). James Hewitt, Isometrics for you. Get fit and trim in 90 seconds a day! (). References
An isometric exercise is a form of exercise involving the static contraction of a muscle without any visible movement in the angle of the joint. The term "isometric" combines the Greek words isos (equal) and -metria (measuring), meaning that in these exercises the length of the muscle and the angle of the joint do not change, though contraction strength may be varied. This is in contrast to isotonic contractions, in which the contraction strength does not change, though the muscle length and joint angle do. References Further reading Ilse Buck, Gesund und schlank durch Isometrik, Auflage. Goldmann, München 1976, (). Lothar M. Kirsch, Isometrisches Training. Übungen für Muskelkraft und Entspannung. Falken Verlag, Niedernhausen im Taunus 1990, (). Theodor Hettinger, Isometrisches Muskeltraining. 6. Auflage. ecomed, Landsberg am Lech 1993, (). Victor Obeck, Isometric. Neu übersetzte Auflage. Scherz, Bern 1980, OCLC 164662767 (anglais: How to Exercise Without Moving a Muscle). James Hewitt, Isometrics for you. Get fit and trim in 90 seconds a day! (). 
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"Isos"
isos
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"metria"
-metria
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Books about isometrics
References
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Further reading
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References