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Exercise - this is a certain kind of movement (lifting, pressing, pulling, pushing). Between 2 types of exercise there should be a 1-minute break.
Repetition - repeating the exercises a certain number of times. Between the repetitions there is half a second break, this is during the resting of the weight.
Serials - these are the total amount of a certain number of repetitions. Between the serials, there should be a 1-minute break.