Planes of Motion: The Sagittal, Frontal and Transverse Planes Explained (With Exercises)

In short

The three planes of motion describe the directions your body moves: forward and back in the sagittal plane, side to side in the frontal plane, and turning or moving across your body in the transverse plane.

If you want to take your training knowledge to a professional level, this article is for you. To build a good training program, you need to understand how your body moves through space. We live in a three-dimensional world, so your body can move in three different planes. Each has its own features, and I want you to know them. Come on, let's get started.

What is a plane of motion?

Planes of motion are an anatomy concept that describes how your body can move through space. We divide them into three:

• Sagittal plane: divides your body into right and left sides.
• Frontal plane: divides your body into front and back.
• Transverse or horizontal plane: divides your body into upper and lower halves.

For each one, I'll show you movements, exercises and the main muscles that work there. An exercise can move in several planes, and a muscle can work in several planes too. You can still look for the main plane of a movement. That is the useful starting point when you plan your training.

How understanding the planes helps your training

There is value in understanding the planes of motion when you train. Here are a few ways they can help you.

Improving technique

Have you ever wondered why each exercise has a particular technique? Every muscle is responsible for certain movements. When you understand which direction you are trying to move in, you can choose an exercise and perform it with that movement in mind. Think of a lateral raise: your arm goes out to the side to work the middle shoulder muscle.

Improving hypertrophy (building muscle)

If you do the same exercises all the time, your body adapts. I like adding movements across the body, out to the side and with rotation, so your muscles get a different stimulus. A systematic review of eight studies (241 young men) found that some planned exercise variation may help growth in different parts of a muscle and maximal strength, while changing exercises too often at random may hold progress back. Keep the new exercises in your plan long enough to improve at them.

Preventing muscle imbalances

Many people neglect exercises in the frontal plane. Take the middle shoulder muscle: a lateral raise gives it direct work that many other exercises do not. If it is missing from your plan, I would add some side-to-side work instead of doing another version of the same forward-and-back movement.

Strengthening stabilizing muscles

Training in different planes also asks stabilizing muscles, such as the shoulder rotators, to work from different directions. That is one more reason I want you to know all three planes, rather than building every session around forward-and-back exercises.

Now that you know why this matters, let's look at each plane.

The sagittal plane

The sagittal plane divides your body into left and right sides. The movements in this plane go forward or backward.

Most of the movements we make in daily life are in the sagittal plane. These movements are mechanically efficient and often let you produce a lot of force. When you walk, you walk forward, not sideways. When you pick something up from the floor, it is usually in front of you, not beside you.

Sagittal plane movements

• Flexion: bending a joint so the angle between two bones gets smaller, like bending your elbow in a curl.
• Extension: straightening a joint so the angle between two bones gets larger, like straightening your elbow in a triceps pushdown.
• Dorsiflexion: lifting the front of your foot toward your shin.
• Plantar flexion: pointing your foot down, or lifting your heel off the floor, like in a calf raise.

Sagittal plane exercise examples

• Biceps curl (elbow flexion)
• Triceps extension (elbow extension)
• Lunge
• Sumo squat
• Front shoulder raise
• Dips (the shoulder and elbow move forward and back)

Main muscles that can work in the sagittal plane

• Front of the arm (biceps)
• Back of the arm (triceps)
• Quadriceps
• Hamstrings
• Glutes
• Core muscles

For exercise ideas, see the best leg exercises and the best bicep exercises.

The frontal plane

The frontal plane divides your body into a front half and a back half. The movements in this plane go out to the sides and back in.

For many people, the muscles that work in this plane get less attention. Other exercises do not always work them enough, so I want you to give side-to-side movements a place in your plan. They also challenge your stability and balance.

Frontal plane movements

• Abduction: moving a body part away from the midline, like lifting your arm or leg out to the side.
• Adduction: moving a body part toward the midline, like bringing your arm back down to your side.
• Side bending: bending your trunk to the right or left.

Frontal plane exercise examples

• Lateral raise (shoulder abduction)
• Side lunge
• Standing hip abduction

Main muscles that can work in the frontal plane

• Middle shoulder muscle (lateral deltoid)
• Hip abductors
• Obliques

For side-of-the-hip work, see band hip abduction in the glute guide, and for the lateral raise, the best shoulder exercises.

The transverse plane

The transverse plane, also called the horizontal plane, divides your body into an upper and a lower half. Movements in this plane include rotation and moving an arm across your body.

Training here matters to me because turning and reaching across your body are part of sport and everyday movement. Rotational exercises give your core work in that direction and let you practice producing force as you turn.

Transverse plane movements

• Rotation: turning inward or outward; your trunk can rotate too.
• Pronation: turning your forearm so your palm faces down.
• Supination: turning your forearm so your palm faces up.
• Horizontal adduction: moving your arm from out at your side toward the front and across your chest, like the squeezing part of a dumbbell fly.
• Horizontal abduction: moving your arm from in front of you back out to the side, like a reverse fly.

Transverse plane exercise examples

• Chest presses, when your elbows point out to the sides (see the bench press guide)
• Dumbbell or cable fly
• Crunch with rotation
• Seated hip abduction or adduction machine, with your hips bent

A dip is mainly a forward-and-back movement, so I put it with the sagittal exercises above. A standing hip abduction is mainly frontal; the seated machine changes the direction of the thigh movement.

Main muscles that can work in the transverse plane

• Chest muscles
• Shoulder rotators
• Serratus anterior
• Hip adductors and abductors

See the best chest exercises for flies and presses, and the best ab exercises for rotation work.

How to check that your weekly plan covers all three planes

I would use the three planes as a check on your program. You do not need an equal number of exercises in each one. Write down your exercises, mark the main plane of each, and look for a plane you have left out. Here are a few common examples:

Here is how an example upper/lower split week looks after the check:

In this example week, all three planes are covered while the big lifts still lead. If side movement or rotation is missing from your own list, add an exercise for each missing direction and keep practicing it long enough to improve. Start light and move with control.

Bottom line

If you want to plan training in a professional way, you need to understand the body's structure and its planes of motion. I use that knowledge to check that a program gives attention to muscles and movements in every direction. It can help you plan for muscle growth, stability and everyday function. Look at your own week and see which plane you may have overlooked.

Frequently asked questions

What are the three planes of motion?

The sagittal plane (forward and backward movements), the frontal plane (side movements), and the transverse plane (turning movements and movements across the body).

What plane is a squat in?

Mainly the sagittal plane: your hips, knees and ankles bend and straighten forward and back. A side lunge moves the same muscles in the frontal plane.

What plane is the bench press in?

Sources classify it differently. With your elbows out, your shoulders move across your body in the transverse plane (horizontal adduction). The closer you tuck your elbows, the more the movement becomes forward and back, in the sagittal plane.

What are examples of frontal plane exercises?

Lateral raises, side lunges, standing hip abduction, side bends, side planks and wide-grip pull-ups.

What are examples of transverse plane exercises?

Dumbbell or cable flies, reverse flies, face pulls, cable woodchops, twisting crunches and band external rotations.

Is the transverse plane the same as the horizontal plane?

Yes. Both names describe the plane that divides your body into upper and lower parts.

Do I need to train all three planes equally?

No. Most strength plans are mostly sagittal, and that is normal. Check for any missing direction and consider adding an exercise for it.

What is a multiplanar exercise?

An exercise that moves in more than one plane at once, like a lunge with a twist or a bicycle crunch.