Cluster set are where we take the total number of repetitions we want to perform in a set and split it up into multiple smaller micro sets called clusters. For example, if you wanted to perform 10 repetitions you would instead do 5 small sets of 2 repetitions with a short (10-30 second) break in-between each. This research article wanted to compare doing these cluster sets compared to traditional sets on muscle adaptions (strength and size). What they found was that the results on gaining muscle size (muscle hypertrophy) and strength were similar between cluster and traditional sets, the only difference was that people found cluster sets easier because there is less fatigue through the set.
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