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What is Partial Reps?
Partial reps are repetitions performed through only part of an exercise's full range of motion, rather than moving the joint from full stretch to full contraction. A lifter might squat only the bottom third, curl only the top half, or press only the last few inches of lockout. Because you skip the hardest or easiest section of the strength curve, partials let you move more weight, target a specific joint angle, or keep a set going once full-range reps are no longer possible.
How it works
Every exercise has a strength curve — some joint angles are mechanically stronger than others. Partial reps deliberately train (or avoid) a section of that curve: lengthened partials load the muscle at its longest, most stretched position, where research increasingly shows a strong hypertrophy signal; shortened partials train the fully contracted position, often used to finish a set once you can no longer complete a full rep. Because tension is confined to one joint angle, the strength built is largely specific to that range and does not fully transfer to the full lift.
Types
Lengthened partials (bottom-half)
Trains the muscle at its longest position — e.g. the bottom half of a squat or Romanian deadlift. Emerging research shows this range drives comparable or greater hypertrophy per set than full ROM for some muscles.
Shortened partials (top-half)
Trains the fully contracted position — e.g. the top half of a curl or leg extension. Common as a past-failure extension technique.
Mid-range partials
Rarely programmed deliberately; usually the byproduct of limited equipment range or joint restrictions rather than a chosen technique.
Worked example
Say you're back squatting 100 kg for 3 sets of 8 full-range reps. On your last working set you grind out 6 clean reps and can't complete a 7th through the full range. Here's how a past-failure partial extension looks.
| Rep | Range used | What happens |
|---|---|---|
| 1-6 | Full range (below parallel to lockout) | Standard reps, taken to technical failure |
| 7 | Top half only (quarter squat) | You can't hit depth anymore, so you shorten the range |
| 8-9 | Top half only | Two more partial reps extend the set past full-range failure |
This adds 2-3 extra reps of mechanical tension at the same 100 kg, but it should supplement — not replace — your full-range working sets.
Partial reps vs full range of motion
| Partial reps | Full range of motion | |
|---|---|---|
| Load used | Heavier (skips the hardest part of the curve) | Lighter, limited by the weakest joint angle |
| Hypertrophy (whole muscle) | Similar or slightly less, on average | Similar or slightly more, on average |
| Strength transfer | Mostly specific to the trained joint angle | Transfers across the full range |
| Best use | Past-failure extension, weak-point work, lengthened-partial finishers | The default for most working sets |
Use full ROM as your base and add partials as a targeted tool, not a replacement.
Common misconceptions
- "Partial reps always build more muscle than full-range reps." A 2020 systematic review (Schoenfeld & Grgic) found full ROM training produced similar or slightly greater hypertrophy than partial ROM across the studies reviewed — partials are a supplement, not a superior default.
- "Because you can lift more weight with partials, they build more raw strength." Strength gained through a limited range is largely angle-specific and does not fully carry over to the full lift, so heavier partial-rep numbers don't always mean a bigger full-range max.
- "Partial reps are only an advanced bodybuilding trick." Lengthened partials at a joint's longest position show a real hypertrophy signal in recent research and can be used by any lifter targeting a specific muscle or sticking point, not just at the end of a set.
Related terms
Partial Reps FAQ
What are partial reps in weightlifting?
Partial reps are repetitions performed through only part of an exercise's full range of motion, such as the bottom half of a squat or the top half of a curl, usually to overload a joint angle or extend a set past failure.
Are partial reps as effective as full range of motion?
For overall muscle growth, research shows full ROM is generally equal to or slightly better than partials. Lengthened partials at a muscle's longest position are an exception, showing comparable or better hypertrophy for some muscle groups.
Do partial reps build strength?
Yes, but the strength gained is largely specific to the joint angle you train, so a bigger partial-rep number doesn't automatically translate into a bigger full-range one-rep max.
When should I use partial reps?
Use them to extend a set past full-range failure, to target a sticking point in a lift, or as a deliberate lengthened-partial finisher — always after, not instead of, your full-range working sets.
What's the difference between partial reps and forced reps?
Partial reps shorten the range of motion to keep a set going; forced reps use a spotter's assistance to complete extra full-range (or partial) reps past failure. The two techniques are often combined.
References
- Schoenfeld BJ, Grgic J. Effects of range of motion on muscle development during resistance training interventions: A systematic review. SAGE Open Med, 2020. PubMed 32030125
- Resistance training beyond momentary failure: the effects of past-failure partials on muscle hypertrophy in the gastrocnemius. PMC, 2025. PMC11847862
- Are Partial Reps a Waste of Time? NASM Blog
- Lengthened Partials: Definition, Uses, Benefits, and Tips Hevy Coach Glossary
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