
Swimming is a full-body workout that provides an excellent cardio workout while engaging multiple muscle groups. The front crawl, also known as freestyle, is the fastest swimming stroke and works several muscle groups simultaneously. It is a great low-impact workout for the whole body, particularly the upper body. The front crawl works the deltoids, biceps, triceps, forearm muscles, latissimus dorsi, trapezius, rhomboids, pectoralis major and minor, hip flexors, quads, hamstrings, glutes, calves, and abdominal muscles.
| Characteristics | Values |
|---|---|
| Muscle Groups | Upper body, arms, legs, core, back |
| Upper Body Muscles | Deltoids, Latissimus Dorsi, Trapezius, Rhomboids, Pectoralis Major and Minor, Rotator Cuff, Biceps, Triceps |
| Lower Body Muscles | Hip Flexors, Quadriceps, Hamstrings, Glutes, Calves, Abdominal Muscles |
| Other Benefits | Cardio fitness, endurance, flexibility |
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What You'll Learn

Upper body muscles including deltoids, biceps, triceps, and forearm muscles
Front crawl, also known as freestyle, is the fastest swimming stroke. It is a great low-impact workout for the whole body, particularly targeting the upper body muscles.
The upper body muscles used in front crawl include the deltoids, biceps, triceps, and forearm muscles. The deltoids, or shoulder muscles, work with the pectoral muscles and triceps to generate power and drive the arms through the water. The deltoids help to 'hold' the 'paddle' (your arm) in place as your body moves past it. The triceps are toned and ripped from the repetitive arm movements in front crawl, and the biceps are also engaged. The forearm muscles assist in pulling, and the biceps are also used in the backstroke.
The shoulder muscles, or rotator cuff, work extremely hard in front crawl, and this can lead to one of the most common swimming injuries: swimmer's shoulder, or subacromial impingement. It is important to strengthen the shoulder muscles and practice proper form to avoid this injury.
In addition to the deltoids, biceps, triceps, and forearm muscles, the upper back muscles are also engaged in front crawl, including the latissimus dorsi and trapezius. The latissimus dorsi muscles, located down the side of the back, work with the back and neck muscles to maintain good body position, alignment, and propulsion. The trapezius muscles in the upper back are also engaged and help to hold a streamlined torso.
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Core muscles including abdominals, obliques, and lower back
Front crawl, also known as freestyle, is a full-body workout that targets multiple muscle groups. It is particularly effective at working the core muscles, including the abdominals, obliques, and lower back.
The abdominal muscles are essential for stabilising the swimmer's body in the water, helping to maintain an effective position to maximise propulsion and minimise drag. This stabilisation also helps to tone the abdominal muscles over time. Additionally, swimmers can further engage their core by sucking in their stomachs to make their core more rigid, which can enhance their body roll and improve their technique.
The front crawl also targets the obliques, which are crucial for the rotational movements required during swimming. The twisting and rotating actions of the torso engage the oblique muscles, contributing to a more powerful and efficient stroke.
Furthermore, the lower back muscles, including the latissimus dorsi and trapezius, play a significant role in front crawl. These muscles are responsible for initiating the catch phase of the stroke, working in conjunction with the chest muscles. They provide the pulling motion that propels the swimmer forward, and their engagement helps develop a strong and streamlined torso.
Overall, front crawl is an excellent exercise for strengthening the core muscles, improving stability, and enhancing swimming technique. The continuous engagement of the abdominals, obliques, and lower back muscles during front crawl contributes to a more efficient stroke and a stronger core.
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Shoulder muscles including the rotator cuff
The rotator cuff is a group of four muscles and tendons that attach to the shoulder bones. It holds the upper arm bone (humerus) in place in its socket in the shoulder blade (scapula). The rotator cuff surrounds the shoulder joint and covers the head of the humerus. It is responsible for raising and rotating the arm. The four muscles that make up the rotator cuff are:
- Supraspinatus: This muscle allows you to rotate and lift your arm. It stretches from the top of the scapula to the upper end of the humerus.
- Subscapularis: This muscle lets you hold your arm outstretched away from your body. It attaches to the middle of the scapula and stretches to the lower part of the humeral head.
- Infraspinatus: This muscle helps you rotate your arm. It reaches from the bottom of the scapula and connects to the humerus behind the supraspinatus.
- Teres minor: This muscle also helps you turn and rotate your arm. It attaches to the outside edge of the scapula and connects to the humerus beneath the infraspinatus.
The rotator cuff muscles and tendons work together to provide stability and mobility to the shoulder joint. They are crucial for movements that involve raising or rotating the arm, such as those required in front crawl swimming. Due to the repetitive nature of the stroke, the rotator cuff muscles are particularly susceptible to injury in swimmers who perform front crawl. This injury is commonly referred to as swimmer's shoulder or subacromial impingement, which is caused by the pinching of the rotator cuff by the shoulder bones.
To prevent rotator cuff injuries, it is important for swimmers to properly stretch and strengthen their shoulder muscles. Specific stretches for the shoulders include shoulder rolls and chest stretches. Additionally, maintaining proper body alignment during swimming can help reduce the risk of rotator cuff injuries. This involves keeping the body horizontal with the ears, shoulders, and hips aligned.
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Leg muscles including quads, hamstrings, and calves
Front crawl, also known as freestyle, is the fastest of the four competition strokes. It is an excellent full-body workout, particularly for the upper body, but it also works the leg muscles, including the quads, hamstrings, and calves.
The legs and torso play an important role in the execution of this stroke, with the flutter kick being responsible for propelling swimmers through the water. This kick uses alternating movements of the feet, with one foot pressing down slightly into the water while the other returns to the surface. This movement engages all the major muscle groups in the lower body, including the feet, calves, hamstrings, and quads. The bulk of the movement is generated by the hips, with the power originating in the glutes and travelling down the legs to the feet.
The abdominal muscles are also engaged and help to stabilise the swimmer's body in the water. The torso plays a key role in generating power, with the side-to-side rotation of the midsection increasing the swimmer's speed. This rotating motion forces the core, specifically the abdominal and oblique muscles, to engage and stabilise the body.
To stretch the leg muscles used in front crawl, you can do a quad stretch by standing with one hand against a wall for balance, bending one knee, and leaning forward until you feel a stretch in the front of your leg. For the hamstrings, sit on the floor with your legs straight out and lean forward to reach for your toes.
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Glutes and hip flexors
The front crawl, also known as freestyle, is the fastest swimming stroke and provides an excellent full-body workout. The stroke involves a combination of fluid arm movements and the well-known flutter kick, engaging multiple muscle groups.
The front crawl works the gluteus maximus, which stabilises the lower body and provides power for each kick. The glutes also work to pull the hips back into a neutral alignment, giving the joints more space to move.
To strengthen the glutes, try placing your hands on your buttocks and standing tall. Take a step backward, keeping the leg long, and feel the activation in the glute on that side. Repeat with the other leg.
The front crawl also engages the hip flexors, quads, hamstrings, and calves. The hip flexors and quads work together with the hamstrings to reduce the risk of injury.
To strengthen the hip flexors, stand with your hands against a wall, as if doing a standing press-up. Stay strong through your glutes, core, and supporting leg as you bring one knee towards your chest. Do three sets of 3-8 reps.
Tight hip flexors can be a sign of weak glutes, so it's important to strengthen both muscle groups to maintain proper alignment and prevent injuries.
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Frequently asked questions
Front crawl, also known as freestyle, works multiple muscle groups, providing a full-body workout. The stroke particularly targets the upper body, including the deltoids, latissimus dorsi, trapezius, triceps, biceps, and forearm muscles.
The muscles of the shoulders and around the shoulder blade, including the deltoids, help to hold the arms in place as the body moves through the water. This can lead to a common swimming injury known as swimmer's shoulder.
Front crawl works the hip flexors, quads, hamstrings, glutes, and calves. The abdominal muscles are also engaged to stabilise the body in the water, providing a core workout.
Front crawl is the fastest competitive stroke and provides an excellent cardio workout. It boosts endurance and helps improve strength, flexibility, and overall health.











































