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RIR vs Percentage-Based Training: The Biggest Change in the 2026 ACSM Guidelines

By Alex Chen·13 min read·April 16, 2026
RIR vs Percentage-Based Training: The Biggest Change in the 2026 ACSM Guidelines

The 2026 ACSM resistance training guidelines just replaced percentage-based programming with RIR (Reps in Reserve). Here's what changed, why it matters, and how to use RIR to program smarter progressive overload — whether you're a beginner or an advanced lifter.

Full article content coming soon.

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