The freestyle stroke is technically not a stroke at all. In competitive swimming, “freestyle” is an event category where you’re free to swim any stroke you choose. But because the front crawl is the fastest way to move through water, virtually every swimmer picks it. The two terms have become interchangeable, and when someone says “freestyle,” they mean the front crawl: a face-down, alternating-arm stroke paired with a flutter kick.
How the Arm Stroke Works
The arm cycle has four distinct phases: entry, pull, push, and recovery. Your hand enters the water in front of your shoulder, fingers first, then reaches forward into the catch position. The pull phase comes next, sweeping your hand and forearm backward under your body. This is actually the slowest phase of the stroke cycle, but it sets up the power that follows.
The push phase is where real propulsion happens. Your hand accelerates past your hip, and this is the fastest part of the cycle along with the entry. Together, the entry and push phases generate the most forward speed. Recovery is the portion where your arm travels above the water back to the starting position. Interestingly, the recovery phase actually creates drag on your body, slightly slowing you down, except during the brief moment when your opposite arm is in its push phase and compensates for it.
The timing between your two arms matters. While one arm pulls underwater, the opposite arm recovers above the surface. This alternating rhythm keeps propulsion relatively continuous, which is a major reason the front crawl is faster than strokes that use both arms simultaneously.
The Flutter Kick
Your legs perform a flutter kick: rapid, alternating up-and-down movements originating from the hips, not the knees. The kick contributes only about 10 to 30% of your total propulsion in freestyle. Its bigger job is keeping your body balanced, streamlined, and properly rotated.
Swimmers use different kick rhythms depending on their goal. A six-beat kick (six kicks per full arm cycle) delivers continuous propulsion and is the go-to pattern for sprints and shorter races. A two-beat kick (two kicks per arm cycle) conserves energy and works best for distances beyond 400 meters. In a two-beat pattern, the downward kick happens as the arm on that same side begins its catch, creating a cross-body connection that drives hip rotation with minimal effort. The two-beat kick functions more as a rotational tool than a propulsion source.
Body Position and Rotation
Good freestyle depends on staying as horizontal as possible. Your body should sit at the surface, roughly parallel to the pool bottom, with about two-thirds submerged and one-third above. Lifting your head to look forward is one of the most common mistakes swimmers make, and it causes your legs to sink. That sinking creates drag and slows you down significantly.
Your body also rotates along its long axis with each stroke, rolling roughly 30 to 45 degrees to each side. This rotation isn’t just a byproduct of the arm movement. It lengthens your reach on the entry, recruits larger back and core muscles during the pull, and makes the recovery easier by lifting your shoulder out of the water. Without rotation, you’re left pulling with just your arm muscles and fighting the water’s resistance on every recovery.
Breathing in Freestyle
Because your face is in the water for most of the stroke, breathing requires turning your head to the side during the arm recovery. You exhale steadily underwater through your nose or mouth, then take a quick inhale as your body rotates and your mouth clears the surface. The goal is to keep one goggle lens in the water during the breath, which means you’re turning your head just enough rather than lifting it.
Bilateral breathing, alternating which side you breathe to every three strokes, helps prevent muscular imbalances that develop from always rotating to one side. U.S. Masters Swimming notes that this symmetry benefit is actually more important than the stroke-balance advantage coaches originally emphasized. If breathing every three strokes feels too oxygen-deprived, alternating sides by lap or by set works too.
Muscles Used in Freestyle
Freestyle is genuinely a full-body movement. Your deltoids and shoulder muscles control hand entry and forward reach. Your forearm muscles do the heavy work during the pull. Upper back muscles stabilize your shoulders throughout the entire stroke cycle, and your core (abdominals and lower back) keeps your body rigid and streamlined to reduce drag. Below the waist, your glutes and hamstrings maintain body position and contribute to kick propulsion.
This broad muscle recruitment is part of why freestyle burns substantial calories. A 150-pound person swimming front crawl at a light to moderate pace burns roughly 594 calories per hour. Push to a moderate-to-vigorous intensity and that climbs to about 716 calories per hour.
Training Tools That Build Better Technique
Three pieces of equipment show up in nearly every swimmer’s bag, each targeting a different part of the stroke. Training fins extend your feet to give extra propulsion, which lifts your hips into proper position and lets you feel what good alignment should be like. They also build ankle flexibility, which is essential for an efficient flutter kick.
Hand paddles increase the surface area of your hand, amplifying feedback on your catch. If your hand enters at a bad angle or slips through the water, you’ll feel it immediately. They build strength in your shoulders, arms, and back while training a cleaner, more powerful pull. A pull buoy is a foam float you hold between your thighs to eliminate kicking entirely, isolating your upper body so you can focus on arm technique, breathing rhythm, and body rotation without distraction.
A typical drill set might combine these tools: four rounds of 50 meters with a pull buoy, focusing on smooth arm recovery and controlled breathing, followed by four rounds of 25 meters kicking with fins for power and leg conditioning. This kind of targeted practice builds the individual pieces of the stroke so they come together more naturally at full speed.