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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.

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    Exercise TechniqueUpdated 12 Oct 2026

    Lifting Tempo: How Fast Should You Do Each Rep?

    What the research says about rep speed and tempo for muscle and strength, with a tempo checker that turns 3-1-1-0 style notation into seconds per rep.

    Exercise TechniqueUpdated 8 Oct 2026

    Full Range of Motion vs Partial Reps for Growth

    What meta-analyses and trials say about full range, partial reps and lengthened partials for muscle growth, plus a stretch-loading guide by exercise.

    Training FrequencyUpdated 5 Oct 2026

    PPL vs Upper Lower vs Full Body: Which Split?

    Does your split matter? What the evidence says on full-body, upper/lower and push/pull/legs, plus a picker showing how often each muscle trains.

    Training IntensityUpdated 1 Oct 2026

    Training to Failure: Do You Need It to Grow?

    Meta-analyses on training to failure vs stopping short for strength and muscle growth, plus a decision aid for where to end each set.

    Training FrequencyUpdated 28 Sept 2026

    Training Frequency: How Often to Train a Muscle

    How many times a week to train each muscle group for growth and strength, based on the evidence — plus a session-frequency planner.

    DeloadUpdated 24 Sept 2026

    Deload Week: When and How to Take One

    When to take a deload week, how long it should last, and how much to cut back — evidence from trials and coach surveys, plus a readiness planner.

    Warm-Up & PreparationUpdated 21 Sept 2026

    How Many Warm-Up Sets Should You Do?

    How many warm-up sets to do before your working sets, and what weight to use — the evidence on specific warm-up, plus a warm-up ramp calculator.

    Rest Between SetsUpdated 28 Sept 2026

    How Long to Rest Between Sets

    How long to rest between sets for strength, muscle growth, power or endurance, based on the evidence — plus a rest interval calculator.

    Rep RangeUpdated 17 Sept 2026

    How Many Reps Should You Do to Build Muscle?

    The evidence-backed rep range for muscle growth, strength and endurance, why hypertrophy is not one fixed zone, plus a rep-range finder for your own goal.

    Progressive OverloadUpdated 28 Sept 2026

    Progressive Overload: How to Actually Apply It

    What progressive overload means, why it beats a fixed routine for muscle growth, and a double progression method for deciding when to add reps or weight.

    One-Rep MaxUpdated 28 Sept 2026

    1RM Calculator: Estimate Your One-Rep Max

    How to estimate your one-rep max from a set you've already done, how accurate Epley and Brzycki are, and what percent of it to train with.

    RecoveryUpdated 28 Sept 2026

    Why Don't All Muscles Recover at the Same Rate?

    Chest can feel ready while triceps still aren't. Fiber mix, compound lifts, and shared work explain different recovery clocks — plus a per-muscle guide.

    RecoveryUpdated 28 Sept 2026

    How Long Should a Muscle Rest Between Sessions?

    How long muscle recovery actually takes, what really changes the timeline, and an interactive guide that tells you if this muscle is ready to train again.

    Training VolumeUpdated 28 Sept 2026

    How Many Sets Per Week for Muscle Growth?

    How many sets per week actually build muscle and strength: the dose-response evidence, honest ranges by training experience, and a weekly volume planner.

    RPE & RIRUpdated 14 Sept 2026

    RPE vs RIR: Which Should You Use?

    RPE and RIR are the same judgement two ways — RIR is roughly 10 minus RPE. What differs, what the accuracy evidence says, and which to use.

    RPE & RIRUpdated 10 Sept 2026

    RPE Chart: RPE to Reps in Reserve and Load

    A working RPE chart for lifters: RPE to reps in reserve, how to turn an RPE into reps to failure, a load calculator, and how far to trust the numbers.

    RPE & RIRUpdated 24 Sept 2026

    RPE in Weight Training: What It Means

    In lifting, RPE means reps in reserve — not general tiredness. What each rating means, how accurate the estimates are, and when RPE is the wrong tool.