Flat Dumbbell Bench Press

What it trains. The dumbbell bench press is a multi-joint press. The shoulders move the upper arms across the body (horizontal adduction) while the elbows straighten.

• Primary: pectoralis major, mainly the sternal (middle and lower) fibres, with the clavicular (upper) fibres contributing.
• Secondary: anterior deltoid (front shoulder) and triceps brachii (elbow extension).
• Stabilisers: the rotator cuff keeps each upper arm centred in its socket, and the biceps works harder than on a barbell to steady the forearm.

Dumbbells vs a barbell. Saeterbakken, van den Tillaar & Fimland (2011) tested 12 trained men on the Smith machine, barbell and dumbbell bench press:

• Load: the dumbbell 1-repetition maximum (1RM) was 17% lower than the barbell and 14% lower than the Smith machine. A dumbbell max is the combined weight of both dumbbells.
• Chest and front shoulder: pectoralis major and anterior deltoid activity did not differ between the three lifts.
• Arms: biceps activity rose as stability fell (Smith machine < barbell < dumbbells), and triceps activity was lower with dumbbells than with the barbell.

Welsch, Bird & Mayhew (2005) found the same pattern for the chest and front shoulder at a 6-repetition maximum: activation did not differ between the barbell and dumbbell bench press, and the authors concluded the two can be used interchangeably.

So the dumbbell press is not a weaker chest exercise. It asks for less load and a little less triceps work, and more steadying from each arm.

Does the choice matter over a training block? Probably not much.

• In Saeterbakken et al. (2020), 35 trained men did 10 weeks of chest pressing with a Smith machine, dumbbells, or a barbell on a Swiss ball. The changes in the untrained barbell bench press were similar across all three groups.
• A 2023 meta-analysis (Haugen et al.; 13 studies, 1,016 participants) found no difference between free-weight and machine training for strength or muscle growth when tested directly against each other. Strength did transfer best to the kind of equipment people trained with.
• The ACSM 2026 position stand found that equipment type did not consistently change training outcomes. Lifting through a complete range of motion, lifting heavier loads (80% of 1RM or more), doing 2–3 sets and training at least twice a week did improve strength.

Pick dumbbells or a barbell for practical reasons: what you have, how your shoulders feel, and whether you want to test a barbell max.

Range of motion. There is no bar to stop on your chest, so dumbbells can travel lower. Use that range only as far as it stays comfortable for the front of your shoulder. More range is not better if it hurts. Full range for your shoulders is what ACSM 2026 links to more strength gain.

Technique cues:

• Get into position safely. Sit on the end of the bench with the dumbbells on your thighs. Lie back and use your knees to help bring the weights to your chest, then press them up.
• Set your base. Feet flat on the floor. Head, upper back and glutes stay on the bench for the whole set. Settle your shoulder blades back and down against the bench.
• Lower under control until the dumbbells are beside your chest or you reach a comfortable stretch. Keep your elbows angled down from your shoulders, partway between your sides and straight out. Don't flare them straight out to the sides.
• Press up and slightly in until the dumbbells nearly meet over your chest. Don't bounce out of the bottom.
• Press straight. Twisting the dumbbells at the top (pinkies together) doesn't add chest work. No study we found shows a benefit (see Dumbbell Press — Ending With a Wrist-Rotation Twist Reduces Pec Contraction).
• Finish safely. Bring the dumbbells to your chest, then to your thighs as you sit up. If you fail a rep, lower the weights to your sides with control rather than over your face. A spotter should hold close to the weights, at your wrists (see Spotting Requirements).

See it. Demo clips in the Fysiqal media library: Flat Dumbbell Bench Press, Incline Dumbbell Bench Press, Flat Barbell Bench Press.

• Anyone building chest, shoulder and triceps strength and size, from beginners through advanced lifters.
• Lifters training alone. You can drop a dumbbell to the side safely; a barbell can pin you without safety arms.
• People whose shoulders feel better when each arm can find its own path, and lifters who want to even out a stronger and a weaker side.

• Healthy shoulders only. This guidance comes from studies of healthy, mostly young, trained men. With current shoulder or chest pain, a recent dislocation or a pec injury, get individual advice first.
• Getting heavy dumbbells into position can limit how heavy you go before your chest does. Past that point a barbell with safety arms is the more practical way to load heavy.
• Small studies. Saeterbakken 2011 had 12 men and Welsch 2005 had 12 people. Muscle-activity (EMG) studies show how hard a muscle works in a rep, not how much it will grow. They point the way rather than give exact numbers for you.
• Specificity. If you want a bigger barbell bench, include the barbell. Strength transfers best to the equipment you train with (Haugen 2023).

Marcus benches 80 kg × 5 on the barbell but trains at home with adjustable dumbbells.

1. Estimate a starting load. About 17% less than his barbell weight (Saeterbakken 2011) is about 66 kg in total, so 32.5 kg per hand. Because each arm has to steady its own dumbbell, he starts lighter at 27.5 kg per hand and works up.
2. Plan for 6 weeks, twice a week:
   • Dumbbell bench press, 3 × 8–10, lowering for 2–3 s.
   • When he gets 10 clean reps on all 3 sets, he adds the smallest step his dumbbells allow (double progression, see Double Progression).
3. Range check. His left shoulder pinches at the deepest stretch, so he stops the dumbbells level with his chest on that side and tucks his elbows a little closer to his sides. The pinch goes away.
4. Result: at week 6 he presses 32.5 kg per hand for 3 × 8 and keeps a barbell session every few weeks to stay used to the bar.

Next lesson: Dumbbell Flyes. Train the same chest muscle with the elbows held still, and see where the fly fits beside the press.

• Primary: pectoralis major. Secondary: anterior deltoid and triceps brachii. Joint actions: shoulder horizontal adduction, elbow extension.
• Dumbbell 1RM was about 17% lower than barbell and 14% lower than Smith machine; chest and front-shoulder activity did not differ (Saeterbakken 2011).
• Dumbbells raised biceps activity and lowered triceps activity compared with the barbell (Saeterbakken 2011).
• Barbell and dumbbell bench presses gave similar chest and front-shoulder activation and can be used interchangeably (Welsch 2005).
• Free weights and machines gave similar strength and growth when tested directly against each other; strength transfers best to the trained equipment (Haugen 2023).
• Complete range of motion, loads of 80% 1RM or more, 2–3 sets and at least 2 sessions a week improved strength (ACSM 2026).