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How many days a week should you strength train?
As many as it takes to fit your weekly hard sets. With the sets matched, two days builds as much muscle as four.
SettledConsistent evidence across meta-analyses.
Updated . The Vanguard coaching team.
What most people miss
Days are the wrong thing to count. What builds muscle is hard sets per muscle per week, and with weekly sets matched, growth came out the same whether they were spread over two days or four, across 25 studies.1
More sets do build more, but each one adds less than the last.2 So the real question is how many hard sets you can do well in a week, and then how many sessions it takes to fit them before the last ones turn sloppy.
Strength is a little different. Across 178 studies, the best-ranked prescription for strength was heavy, several sets, three times a week.3
So two sessions a week is a real program, not a compromise, as long as the sets are in it.
The research
The papers behind the answer
Each one checked against the paper itself. The grade describes the strength of the evidence, never anyone's results.
Schoenfeld, Grgic, Krieger, 2019 · J Sports Sci
Meta-analysis · 25 studies
With weekly volume matched, training a muscle more or less often made no significant difference to growth.
Read the paper by Schoenfeld, Grgic, Krieger, 2019 (opens in a new tab)Pelland, Remmert, Robinson et al., 2026 · Sports Med
Meta-regressions · 67 studies · 2,058 people
Four weekly sets was the smallest dose with detectable growth; each further step took more sets (about 6 between 5 and 10 sets, about 10.75 between 19 and 29). Indirect sets counted as half fitted best. 78% of the growth data came from sets to failure.
Read the paper by Pelland, Remmert, Robinson et al., 2026 (opens in a new tab)Currier, Mcleod, Banfield et al., 2023 · Br J Sports Med
Network meta-analysis · 178 studies · 5,097 people
Loads above 80% of a max built the most strength; heavy, multi-set, three times a week ranked first. Every prescription grew muscle about equally.
Read the paper by Currier, Mcleod, Banfield et al., 2023 (opens in a new tab)
Research describes groups of people. Your coach will tell you how it applies to you.
From the floor
The app counts your hard sets per muscle every week, so two sessions or four, the week adds up to the work it needs. Your coach fits the plan to the days you actually have.
The Vanguard coaching team