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Source-backed references for lifters: what the research actually supports, where it is uncertain, and how Reppit puts it into practice. Every page states its sources and carries at least one tool, reference or decision aid you can use immediately.

• RPE & RIRUpdated 28 Aug 2026

  RPE vs RIR: What's the Difference and Which Should You Use?

  RPE and RIR are the same judgement expressed two ways — RIR is roughly 10 minus RPE. What actually differs, what the accuracy evidence says about both, and a decision aid for picking one.

• RPE & RIRUpdated 28 Aug 2026

  RPE Chart: RPE to Reps in Reserve and Load

  A working RPE chart for lifters: RPE to reps in reserve, the one line that converts an RPE into reps to failure, a load calculator built on Reppit's own 1RM formulas, and how far to trust it.

• RPE & RIRUpdated 28 Aug 2026

  RPE in Weight Training: What It Means and How to Use It

  In lifting, RPE means reps in reserve — not general tiredness. What each rating means, how accurate the estimates really are, and when RPE is the wrong tool, with an interactive RPE/RIR reference table.