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What are the phases of a strength training repetition?

A repetition has 3 movements. You have concentric, adding force to the body. Isometric is holding the weight in place for a period of time. Eccentric is to return the weight to the start.

Grant Cooper, MD
Physical Medicine & Rehabilitation
Each repetition has a positive and negative phase. The positive phase of the repetition is when the muscle is contracting. In the biceps curl, the positive phase is when you are raising the weight against gravity. During this motion, the biceps muscle contracts, becoming shorter. The negative phase of the repetition is when the muscle elongates (lengthens). In the biceps curl, the negative phase is when you lower the weight and straighten your arm.

It is more difficult to perform the negative phase of a repetition than the positive one.
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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.