Skip to main content
Back to Blog
training 2 min read

Does Training Closer to Failure Actually Build More Muscle?

Yes—muscle growth improves the closer you take sets to failure, while strength gains stay solid across a wide range of effort levels. A 2024 series of multilevel meta-regressions quantified proximity to failure as estimated repetitions in reserve (RIR) across the literature and found a clear dose-response for hypertrophy: bigger size gains as sets ended nearer to zero RIR. Strength, by contrast, showed essentially no meaningful relationship with how close to failure you went.

Does Training Closer to Failure Actually Build More Muscle?

The Core Finding

Yes—muscle growth improves the closer you take sets to failure, while strength gains stay solid across a wide range of effort levels. A 2024 series of multilevel meta-regressions quantified proximity to failure as estimated repetitions in reserve (RIR) across the literature and found a clear dose-response for hypertrophy: bigger size gains as sets ended nearer to zero RIR. Strength, by contrast, showed essentially no meaningful relationship with how close to failure you went.

🏋️‍♂️ Key Takeaways

  • Push closer for size: Terminate most working sets with 0–2 RIR when hypertrophy is the priority—growth keeps improving as you approach failure.

  • Leave more in the tank for strength: Heavy strength work responds well across a broad RIR range; grinding every set to absolute failure is unnecessary and can add fatigue without extra payoff.

  • Match effort to the goal: Use higher effort (lower RIR) on isolation or secondary movements when chasing muscle; keep primary compound lifts a bit further from failure when strength is the main target.

  • Log it deliberately: Track estimated RIR on key sets so you can adjust week to week instead of guessing.

⚠️ The Catch (Study Weaknesses)

The analysis is exploratory. RIR values had to be estimated from study descriptions rather than directly measured in every trial, so the exact shape of the dose-response curve carries uncertainty. Overall model fit was only modest, and the authors explicitly caution that future studies designed specifically to test continuous RIR effects in larger samples are still needed.

📲 The Adi.fit Application

Busy professionals and parents: on your next upper or lower session, pick 1–2 key exercises per muscle group and deliberately take the last set to 0–1 RIR while keeping the earlier sets at 2–3 RIR. Log the workout (and the RIR notes) inside Adi.fit so you can see the effort pattern across the week and stay consistent without living in the gym. Use the macros and challenge tools to keep recovery and protein dialed in while you experiment with the higher-effort sets—exactly the closed-loop approach the platform is built for.

Scientific Reference: Exploring the Dose-Response Relationship Between Estimated Resistance Training Proximity to Failure, Strength Gain, and Muscle Hypertrophy: A Series of Meta-Regressions. Robinson ZP, Pelland JC, Remmert JF, Refalo MC, Jukic I, Steele J, Zourdos MC. 2024. PMID: 38970765 (DOI: 10.1007/s40279-024-02069-2).