Is the floor fly as effective as a dumbbell fly on a bench?

It works the same muscles, but the floor cuts off the deepest part of the range, so the chest is never stretched as far as it is on a bench. It is a solid choice without a bench or when the bench version bothers the shoulders, and the bench Dumbbell Fly is the next step when you want more range.

Should my legs be straight or my knees bent?

Either works, and the choice barely changes the work for the chest. Bending the knees with the feet flat on the floor can make the lower back more comfortable and the body more stable, while straight legs keep the setup simple.

Can the floor fly replace pressing for chest?

It works best alongside pressing rather than instead of it. In resistance-trained men lifting their six-rep max, a dumbbell fly on a bench, lowered to chest depth, produced less pectoral, front deltoid and triceps activity than the barbell bench press, with the biggest gap near the top of the rep. A Dumbbell Floor Press or Push-Up followed by floor flys covers both.

Should I pause with my arms on the floor?

A brief pause with the upper arms resting lightly on the floor is a good way to stop bouncing and keep the reps consistent. Keep the chest engaged during the pause rather than letting the arms go fully slack.

How heavy should the dumbbells be?

Use a weight you can lower under control for every rep without the elbows bending into a press. Flys are usually trained for moderate to higher reps, such as 10 to 15, rather than for heavy singles.

Dumbbell Floor Fly

What Is the Dumbbell Floor Fly?

Dumbbell Floor Fly is an isolation exercise that primarily targets the chest and also engages the front deltoids. It is a beginner-level movement performed lying on the floor, where the dumbbells travel out to the sides in a wide arc and the floor stops the upper arms at about the level of the torso, so the shoulders never drop below the body the way they can on a bench.

Like every fly, it trains the chest's job of drawing the arms across the body. The elbows hold one slight bend from start to finish instead of bending and straightening, so the triceps do little and the chest does most of the work. That makes it a natural accessory after pressing, and a staple of home workouts where there is a pair of dumbbells but no bench.

Compared with the Dumbbell Fly on a flat bench, the floor cuts off the bottom of the range, which is both where a fly is hardest and where the chest is most stretched. That trades some of the stretch for a built-in stop, and many lifters can handle slightly heavier dumbbells as a result. The load is greatest just before the upper arms reach the floor and fades as the arms rise toward vertical, so the work sits in the lower half of each rep. The Dumbbell Floor Press and Kettlebell Floor Press use the same position on the floor, but they bend and straighten the elbows, bring in the triceps and allow much heavier loads.

The floor fly suits beginners learning the fly pattern, lifters training at home, and anyone who finds the deep stretch of a bench fly uncomfortable at the front of the shoulder. Thinking of hugging a large tree rather than pushing the weights up helps keep the chest doing the work. Once the floor version feels easy and pain-free, the bench Dumbbell Fly or the Cable Seated Chest Fly adds range or a different resistance curve.

Muscles Worked

MuscleActivation

Pectoralis Major: Primary
Deltoid: High
Biceps Brachii: Low
Flexor Carpi Radialis: Low
Serratus Anterior: Low
Flexor Carpi Ulnaris: Minimal
Rectus Abdominis: Minimal
Triceps Brachii (Long Head): Minimal

Instructions

Sit on the floor with a dumbbell in each hand resting on your thighs, then lie back and extend your legs along the floor.
Press the dumbbells up over your chest with your palms facing each other and a slight bend in your elbows.
Pull your shoulder blades down and back and press them into the floor.
Inhale and lower the dumbbells out to your sides in a wide arc, keeping the same slight bend in your elbows.
Continue until your upper arms touch the floor out to your sides, roughly in line with your chest, with your palms facing the ceiling.
Pause briefly with your upper arms resting lightly on the floor, keeping your chest engaged.
Exhale and squeeze your chest to sweep the dumbbells back up along the same arc, stopping just before they touch over your chest.
Repeat for the desired reps, then bend your elbows and bring the dumbbells to your chest before sitting up.

Common Mistakes

Locking the elbows
Straightening the arms turns the fly into a long lever that strains the elbows and the front of the shoulders.
Turning it into a press
Letting the elbows bend more as the weights come down shifts the work to the triceps and turns the fly into a floor press.
Bouncing off the floor
Dropping the upper arms onto the floor and rebounding takes tension off the chest and jars the elbows.
Shrugging the shoulders
Letting the shoulders roll up toward the ears shifts the load from the chest to the front of the shoulders.
Clanking the weights at the top
Resting with the arms vertical and the dumbbells knocking together removes tension from the chest between reps.
Using too much weight
Dumbbells that are too heavy force the elbows to bend and the arms to fall to the floor instead of lowering under control.

Injuries

Dumbbell Floor Fly is a low risk exercise when performed with proper technique. The floor stops the upper arms at about torso level, which removes the deep, loaded stretch at the front of the shoulder that causes most shoulder complaints in a bench fly.

The main strain points are the front of the shoulder and the chest near the armpit at the bottom of each rep, especially when the dumbbells are too heavy or the elbows straighten into a long lever. Locked elbows also load the elbow joint and the biceps tendon, and dropping the arms onto the floor instead of touching down lightly can bruise the elbows. Getting heavy dumbbells into and out of position is its own risk, so bend the elbows and bring the weights to the chest before sitting up rather than letting them fall out to the sides.

Keep a slight, fixed bend in the elbows, touch the floor lightly, and choose a weight you can lower under control for every rep. If the fly position bothers the shoulder, the Dumbbell Floor Press trains the chest from the same position with the elbows closer to the body. To progress, add load gradually or move to the bench Dumbbell Fly or the Dumbbell Incline Fly once the floor version is comfortable.

Stop if you feel sharp pain at the front of the shoulder or in the chest. A pop, sudden weakness or bruising around the chest or armpit can signal a pectoral tear and needs medical assessment before training continues.

Overview

Primary Focus: Chest
Equipment: Dumbbell
Modality: Strength
Difficulty: Beginner

Alternative Exercises

Frequently Asked Questions

Q: Is the floor fly as effective as a dumbbell fly on a bench?: It works the same muscles, but the floor cuts off the deepest part of the range, so the chest is never stretched as far as it is on a bench. It is a solid choice without a bench or when the bench version bothers the shoulders, and the bench Dumbbell Fly is the next step when you want more range.
Q: Should my legs be straight or my knees bent?: Either works, and the choice barely changes the work for the chest. Bending the knees with the feet flat on the floor can make the lower back more comfortable and the body more stable, while straight legs keep the setup simple.
Q: Can the floor fly replace pressing for chest?: It works best alongside pressing rather than instead of it. In resistance-trained men lifting their six-rep max, a dumbbell fly on a bench, lowered to chest depth, produced less pectoral, front deltoid and triceps activity than the barbell bench press, with the biggest gap near the top of the rep. A Dumbbell Floor Press or Push-Up followed by floor flys covers both.
Q: Should I pause with my arms on the floor?: A brief pause with the upper arms resting lightly on the floor is a good way to stop bouncing and keep the reps consistent. Keep the chest engaged during the pause rather than letting the arms go fully slack.
Q: How heavy should the dumbbells be?: Use a weight you can lower under control for every rep without the elbows bending into a press. Flys are usually trained for moderate to higher reps, such as 10 to 15, rather than for heavy singles.