What Is Range of Motion?
Range of motion (ROM) refers to how far a joint moves during an exercise - from the starting position to the end position. Full ROM means moving through the complete available range of the joint for that exercise.
What Research Shows
Multiple studies have shown that training with a full range of motion produces greater muscle hypertrophy than training with partial range of motion, even when total training volume is matched. The stretched (lengthened) position appears to be particularly important for muscle growth.
Why Full ROM Is Superior
More Muscle Fibers
Full ROM tends to challenge more of the muscle through a larger portion of the movement, which can support more complete development.
Stretch Under Load
The stretched position creates high mechanical tension which is a primary driver of muscle growth.
Flexibility Benefits
Training through full ROM maintains and can even improve flexibility over time.
Full ROM Examples by Exercise
Squat
Full ROM
Descend until your hip crease is at or below your knee (parallel or deeper), then stand fully upright. This ensures full quadriceps, glute, and hamstring engagement. See our squat form guide for details.
Bench Press
Full ROM
Lower the bar until it touches your chest (with control), then press until your arms are fully extended. Don't bounce off the chest or stop short.
Bicep Curl
Full ROM
Start with arms fully extended, curl all the way up until forearms touch biceps (or close), then lower back to full extension. Avoid cutting the bottom short.
Lat Pulldown
Full ROM
Start with arms fully extended overhead (feel the lat stretch), pull down to your upper chest, then return to full stretch. The stretch at the top is where the growth happens.
The Importance of the Stretched Position
Why the Stretched Position Matters
Recent research suggests that the stretched (lengthened) position of a muscle is particularly potent for stimulating growth. This is why exercises that load the muscle in a stretched position (like RDLs, incline curls, and overhead tricep extensions) are especially effective.
What About Partial Reps?
Partial reps have their place, but they're not a substitute for full range of motion training. Here's when they might be useful:
When Partials Are Useful
- Extending a set after failure (burn-out)
- Working around an injury
- Overloading a specific ROM (advanced)
- Sport-specific training (powerlifting lockouts)
- When mobility limits full ROM safely
Problems with Only Partials
- Less muscle growth
- Strength only at trained ROM
- Reduced flexibility over time
- Incomplete muscle development
- Often just ego lifting
The Ego Problem
The most common reason people use partial reps is to lift more weight. Half-squatting 150kg looks more impressive than full-squatting 100kg, but the full squat will build more muscle and strength. The issue is not partial reps themselves, but using them to avoid the harder and often more productive full range of motion.
When to Limit Range of Motion
There are legitimate reasons to limit ROM on certain exercises:
Joint Pain
If a certain range causes pain, work within pain-free ROM while addressing the underlying issue.
Injury Recovery
During rehabilitation, limited ROM may be prescribed to protect healing tissues.
Mobility Limitations
If you lack the mobility for full ROM, work within your current range while improving flexibility.
How to Improve Your Range of Motion
Strength Train Through Full ROM
Using full ROM in your training actually improves flexibility over time. The weight provides a stretch.
Static Stretching Post-Workout
Hold stretches for 30–60 seconds after training when muscles are warm and pliable.
Dynamic Stretching Pre-Workout
Use movement-based stretches in your warm-up to prepare joints for full ROM.
Foam Rolling
Self-myofascial release can help improve tissue quality and ROM when used consistently.
Patience Is Key
Improving mobility takes weeks to months of consistent work. Don't expect overnight changes. Gradually increase your ROM as flexibility improves, always staying within pain-free ranges.
Sources & References
- Schoenfeld BJ, Grgic J. (2020). "Effects of Range of Motion on Muscle Development During Resistance Training Interventions: A Systematic Review." SAGE Open Med, 8: 2050312120901559. PubMed