Exercises / Chest
Chest · Horizontal Press
Barbell Bench Press
Also known as: Barbell Bench Press ／ Flat Bench Press
- Joint action
- Shoulder horizontal adduction + elbow extension
- Plane
- Primarily transverse plane
- Chain
- Open kinetic chain for the upper limb; the lower body and trunk act as a closed-chain support base against the bench and floor.
- Body part
- Chest
- Equipment
- Barbell
- Prime moverPectoralis major
- SynergistAnterior deltoid, Triceps brachii
- StabilizerSerratus anterior, Rotator cuff (not shown)
- AntagonistLatissimus dorsi
A conceptual map coloring representative muscles by role. Varies by individual and form; deep muscles may not be shown.
Muscle map: body-muscles (Apache-2.0)
Definition
The barbell bench press is performed lying supine on a flat bench, pressing a barbell up over the chest — a signature free-weight compound exercise. Because both hands are fixed to a single bar, it allows heavier loads and a more stable bar path than dumbbells, but often produces a 'sticking point' — a sharp mid-lift deceleration. It is a central exercise in both general strength training and powerlifting.
Muscle-length profile
The pectoralis major is most lengthened at the bottom position, where the bar touches the chest (shoulder horizontal abduction). Because the chest acts as a hard stop, a barbell can't descend as deep as dumbbells can, so the bottom of the range tends to be slightly shallower than with the dumbbell version (see the flat dumbbell press page for a direct comparison).
Anatomy: muscles involved
Colors in the muscle map correspond to the roles below (prime = red / synergist = blue / stabilizer = amber / antagonist = gray).
| Role | Muscle | Action in this exercise |
|---|---|---|
| Prime mover | Pectoralis majorMainly the sternal head (distribution shifts with grip width and bench angle) | The prime mover for shoulder horizontal adduction. Because both hands are fixed to a single bar, the arms move in perfect synchrony. |
| Synergist | Anterior deltoid | Assists the initial press; its contribution increases as bench angle increases. |
| Synergist | Triceps brachii | Handles elbow extension; especially critical for lockout and getting through the sticking region. |
| Stabilizer | Serratus anterior | Stabilises the scapula against the ribcage; demand is thought to be somewhat lower than with dumbbells, since the bar path is fixed. |
| Stabilizer | Rotator cuff | Keeps the humeral head centred in the glenoid. As a deep muscle it is not shown in the figure. |
| Antagonist | Latissimus dorsi | As an antagonist, controls the lowering phase. Powerlifters sometimes deliberately engage it alongside an arched back setup to help drive through the sticking region. |
Muscle length & resistance curve
Setup: Flat bench, barbell ／ Bench 0°
Looking only at the gravitational moment arm, load tends to be greatest near the bottom (bar close to the chest) and decreases toward lockout. However, there is also a 'sticking region' — a sharp mid-lift deceleration — that cannot be explained simply by changes in the shoulder or elbow moment arm. This is not a simple curve where the bottom is uniformly hardest.
Form variables & evidence
| Variable | Condition | Effect | Evidence |
|---|---|---|---|
| Grip width | Narrow vs medium vs wide | Pectoralis major activation is reported as similar across grip widths, contradicting the simpler 'wide hits chest, narrow hits arms' folklore. In trained lifters, wide grip shows slightly lower triceps activation and markedly higher biceps (stabilizer) activation, while narrow grip produces 7-8% lower 6-RM loads.This reflects differences in muscle activity (EMG), not a direct demonstration of long-term hypertrophy differences. | Muscle activationAcute EMGConf. Moderate |
| Bench angle | Flat (0°) vs 30° incline vs steeper | Upper (clavicular) pectoralis activation peaks around 30°, while flat maximizes middle/lower (sternal) pectoralis activation. Beyond 45°, anterior deltoid involvement becomes dominant and relative pectoralis stimulus decreases.This is an acute EMG study and does not directly demonstrate long-term regional hypertrophy differences. | Muscle activationAcute EMGConf. Moderate |
| Getting through the sticking point | The sharp mid-lift deceleration phase | Classically, the sticking point could not be simply explained by moment-arm changes at the shoulder or elbow. A recent link-chain model explains it as a local velocity minimum occurring when shoulder torque drops below a critical threshold, with grip width (the horizontal distance between shoulder and bar path) shaping its occurrence more than individual muscle architecture.The 1989 measurement study had only 10 elite powerlifters. The 2025 study is a mathematical model, not a direct human intervention study. | Joint kinematicsBiomechanicsConf. Low |
| Which muscles hypertrophy over a 10-week training intervention | Bench press alone, 3x/week for 10 weeks | Cross-sectional area (CSA) of the pectoralis major, pectoralis minor, anterior deltoid, and triceps brachii increased significantly versus control, while the medial deltoid showed no comparable increase. The pectoralis major showed larger CSA gains than the pectoralis minor and triceps brachii.Single RCT with n=24 over 10 weeks — modest scale and duration. Participants appear to range from untrained to moderately trained. | HypertrophyLongitudinal trialConf. Moderate |
Evidence is shown by 'what was measured (outcome / study type)' and 'confidence' separately. The best choice varies by individual and goal.
Common misconceptions
A wide grip 'hits' the chest, while a narrow grip 'hits' the triceps
Studies comparing pectoralis major activation found no clear difference across grip widths. Triceps activation was somewhat lower with a wide grip than medium, but the difference was not dramatic. The more consistent finding was that biceps activation (a stabilizing role) changed substantially with grip width.
The sticking point simply happens because leverage is unfavorable at that position
The classic 1989 study found the sticking point couldn't be explained simply by an increased moment arm at the shoulder or elbow. A recent link-chain model similarly found that geometric factors like grip width and barbell constraints shape the phenomenon more than individual muscle architecture, suggesting the simple 'unfavorable leverage' explanation is incomplete.
Safety
- •When lifting heavy, always set safety bars or have a spotter present.
- •Warm up properly and use a manageable load and range of motion.
- •Stop and consult a professional if you feel sharp pain or discomfort in the shoulder, elbow, or wrist.
- •If you have a history of shoulder or chest (e.g. pectoral tendon) injury, adjust range of motion and load especially carefully.
This information is for general educational purposes and is not medical advice.
References
- Saeterbakken et al. (2021) Int J Environ Res Public Health — grip width, EMG, and strength
- Rodríguez-Ridao et al. (2020) Int J Environ Res Public Health — five bench inclinations and EMG
- Elliott, Wilson & Kerr (1989) Med Sci Sports Exerc — biomechanics of the sticking region
- Evangelista et al. (2025) J Funct Morphol Kinesiol — link-chain model of the sticking region
- Lanza et al. (2024) J Bodywork Mov Ther — 10-week hypertrophy across four muscles
Written by
Shingo YoshizakiSoftware Engineer / Research Writer at BODYDATA
An engineer's job is verification. I read the source before I trust gym lore — same as code.
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Reviewed by: Tomonobu Someda
Content reviewed from the perspective of coaching practice and supplement-industry experience
Related content
Related studies
- Other
Effect of Grip Width on Bench Press Strength and Muscle Activation in Novice and Resistance-Trained Men
International Journal of Environmental Research and Public Health, 2021
A cross-sectional study in 15 resistance-trained and 13 novice men comparing 6-RM load and muscle activation (EMG) across narrow, medium, and wide grip widths. Pectoralis major activation was similar across grip widths, while in trained men the wide grip showed slightly lower triceps brachii activation and markedly higher biceps brachii (stabilizer) activation. The narrow grip produced 7-8% lower 6-RM loads than the other two conditions.
View study details - Other
Effect of Five Bench Inclinations on Pectoralis Major, Anterior Deltoid, and Triceps Brachii Muscle Activity During the Bench Press
International Journal of Environmental Research and Public Health, 2020
A cross-sectional study in 30 trained adults performing bench press at 60% 1RM for 8 reps across five bench inclinations (0°, 15°, 30°, 45°, 60°), comparing EMG activity of the upper/middle/lower pectoralis major, anterior deltoid, and triceps brachii. Upper pectoralis activation peaked around 30°, while middle/lower pectoralis activation peaked at 0° (flat). Beyond 45°, anterior deltoid activation became dominant.
View study details - Other
A Biomechanical Analysis of the Sticking Region in the Bench Press (Elite Powerlifters)
Medicine & Science in Sports & Exercise, 1989
A classic study analyzing 10 elite powerlifters at approximately 80% 1RM, a maximal lift, and a failed lift using 3D cinematography and surface EMG. The 'sticking region' — a sharp deceleration mid-lift — could not be simply explained by an increased moment arm or reduced muscle activity at that point. The shoulder joint moment arm decreased consistently throughout the ascent, while the elbow joint moment arm reached its minimum near the sticking region before increasing again.
View study details - Other
Decoding the Contribution of Shoulder and Elbow Mechanics to Barbell Kinematics and the Sticking Region in Bench and Overhead Press Exercises: A Link-Chain Model
Journal of Functional Morphology and Kinesiology, 2025
A theoretical/mathematical link-chain biomechanical model incorporating single- and two-joint muscles, analyzing what causes the sticking region in the bench press and overhead press. The sticking region is explained as a local minimum in barbell velocity that emerges when shoulder torque drops below a critical threshold relative to the barbell's geometric constraints. Grip width (the horizontal distance between the shoulder joint and the barbell's vertical path) was found to shape this phenomenon more strongly than individual muscle architecture parameters.
View study details - Randomized controlled trial
Muscle Hypertrophy Response Across Four Muscles Involved in the Bench Press Exercise: A 10-Week Randomized Training Intervention
Journal of Bodywork and Movement Therapies, 2024
A 10-week longitudinal intervention RCT in 24 healthy men (13 training, 11 control), training the bench press exercise alone 3 times per week. Cross-sectional area (CSA) of the pectoralis major, pectoralis minor, anterior deltoid, and triceps brachii increased significantly more in the training group than control, while the medial deltoid showed no similar increase. The pectoralis major showed larger increases than the pectoralis minor and triceps brachii.
View study details