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The CMJ is the standard of jump testing. A repeatable and easy to perform test, the CMJ provides deep insight into athletic ability, and is a great example of a relatively slow stretch-shortening cycle (eccentric-concentric contraction).
The Isometric test is used for Isometric mid-thigh pull tests, and can be used for any other isometric test where RFD (rate of force development) is of interest. Isometric squats and isometric hamstring tests are easily performed using this protocol.