I love cluster sets. I’m just going to state that at the beginning of this article so you know my bias. But this isn’t just an opinion piece based on my experience with them. I’ve done a ton of research to show you the what, when, why, and how that underpins this potent set-and-rep configuration. I hope this article can be a comprehensive guide to cluster training. But before we get into that we’ll start at the beginning to understand what constitutes a cluster set and how it differs from traditional strength training.