Set

A set is a specific number of repetitions performed consecutively without resting (Fleck & Kraemer, 1997). The standard workout notation is written as reps multiplied by sets — for example, 2 x 8 means 2 sets of 8 repetitions.

The effectiveness of a single-set strength training program is supported by many studies in the short term (about 2 to 3 months). However, single-set training becomes considerably less productive after 4 months. At that point, multiple-set training may be the best approach for making further progress.

Meta-analytic evidence since (Krieger 2010 and later dose-response reviews) shows multiple sets give a modest but consistent hypertrophy edge over single sets from early on — roughly 40% greater effect size in some pooled estimates — rather than single-set training being fine for a defined ~4-month window and then failing. Most of the volume benefit is realized by about 2-6 hard sets per muscle per session, with diminishing returns beyond that. Single-set training is still a legitimate, time-efficient option (especially for beginners), just not one with a fixed expiration date. See verification_note in this module's frontmatter.

• A set = a number of reps done consecutively without rest.
• Notation: 2 x 8 = 2 sets of 8 reps.
• Single-set programs are effective for ~2-3 months but become less productive after 4 months (source's original claim).
• After ~4 months, multiple-set training is best for continued progress (source's original claim).
• 2026 update: multiple sets give a modest, consistent hypertrophy edge over single sets from the start (not a 4-month cutoff); most benefit comes from 2-6 hard sets per muscle per session.

• number-of-sets — how many sets to prescribe.
• single-set — the single-set training system.
• multiple-set — the multiple-set training system.
• repetition — reps are the unit counted within a set.
• repetition-maximum — the companion 2026 update on the RM-continuum.