If young guys who already lift weights do just 9 sets of biceps exercises in one workout each week for 6 weeks, they’ll still gain noticeable arm muscle and strength.

What we've found so far suggests that doing 9 weekly sets of biceps training in a single session may increase muscle size and strength in trained young men over 6 weeks. Our analysis of the available evidence shows this effect is supported by the data we’ve reviewed. We analyzed 63.0 assertions from the research, and all of them support the idea that young men who already lift weights can gain noticeable arm muscle and strength by performing 9 sets of biceps exercises in one workout each week for 6 weeks [1]. No studies in our review refuted this outcome. This means the evidence we’ve reviewed leans toward a positive effect on both muscle growth and strength from this specific training approach. We don’t yet know how this compares to spreading the same volume across multiple sessions, or whether more or fewer sets would work better. Our current analysis only covers this specific routine — 9 sets done once per week — and only in young, trained men. We’re not able to say whether the results would be the same for older individuals, untrained people, or women, based on what we’ve reviewed so far. It’s also important to note that while the evidence leans positive, we’re still building our understanding. New data could change how we interpret these findings over time. Practical takeaway: If you’re a young guy who already lifts weights, doing 9 sets of biceps work in one session each week might be enough to build arm size and strength in as little as 6 weeks.