Advanced Breaststroke Technique: Speed Differences and Technical Choices Between Narrow-Kick and Wide-Kick Breaststroke

Introduction

Breaststroke is the one of the four competitive swimming strokes that places the greatest emphasis on leg technique, with the leg kick contributing approximately 60%–70% of the propulsion in breaststroke. However, even swimmers with many years of experience often feel confused when choosing between the “narrow-kick” and “wide-kick” breaststroke. These two styles differ significantly in speed, joint stress, and suitability for different swimmers. This article provides an in-depth analysis for you.

Basic Mechanics of the Breaststroke Kick

The propulsion of the breaststroke kick comes from the “kick-out” action, where the legs push outward and backward from the tucked position. During this process, the larger the surface area of the soles and calves facing the water, and the faster the kick-out speed, the greater the propulsion generated.

The direction of the kick is diagonally backward (rather than purely backward), so after the legs kick out, they need to be brought together and return to a streamlined position to avoid the increased water resistance caused by an open-leg position.

Narrow-Kick vs Wide-Kick Breaststroke

Narrow-Kick Breaststroke (Wave Breaststroke / Undulating Style)

The narrow-kick breaststroke is characterized by a narrower knee spacing during the tuck (close to or shoulder-width apart), with the kick angle directed more toward the rear. The movement path is closer to a “flat” ellipse, with less body undulation.

Advantages:

• Lower water resistance (knees do not flare widely into the water during the tuck)
• Faster stroke rate possible (suitable for sprint distances)
• Does not require a particularly large degree of hip abduction

Disadvantages:

• If hip abduction is limited, the soles cannot fully turn outward in the narrow-kick style, reducing kick efficiency
• The glide distance per kick is shorter

Wide-Kick Breaststroke (Wide-knee Breaststroke)

In the wide-kick breaststroke, the knees flare outward more during the tuck, and the arc path of the kick is wider. The body’s wave motion is more pronounced, and the glide distance after each kick is relatively longer.

Advantages:

• Greater propulsion per kick (wider propulsion surface)
• Longer glide distance, suitable for long-distance breaststroke
• Suitable for swimmers with greater hip abduction range (such as those with naturally looser ligaments)

Disadvantages:

• Knee flaring during the tuck increases the frontal surface area, resulting in higher water resistance
• Slower stroke rate
• Greater stress on the knee joints (particularly the medial collateral ligament)

Technical Comparison Table

The Key to Determining Kick Style: Hip Joint Structure

When choosing between narrow-kick and wide-kick breaststroke, the most important reference is an individual’s hip joint structure, not subjective preference.

Characteristics suited to wide-kick breaststroke:

• Frog Test: Lying on your back with the soles of your feet together, let your knees fall open naturally. If your knees can approach the ground, your hip abduction range is sufficient
• Naturally looser ligaments (Generalized Hypermobility)
• Informal test: A greater natural outward toe angle when standing

Characteristics suited to narrow-kick breaststroke:

• Limited hip abduction range
• History of knee injury (particularly medial)
• Preference for a high-frequency arm stroke style

Common Mistakes in Breaststroke Kick Styles

• “Bicycle pedaling” error: Kicking one leg at a time rather than simultaneously, causing the propulsion from each leg to cancel each other out
• Insufficient ankle dorsiflexion: The soles are not turned outward (dorsiflexed) before the kick, greatly reducing the propulsion surface area
• Failure to bring the legs together promptly after the kick: Keeping the legs open after the kick is completed, continuously increasing water resistance
• Tucking too slowly: The tuck should be performed as quickly as possible to shorten the period of greatest water resistance

Training Recommendations for Breaststroke Kick Styles

Ankle flexibility training:
The propulsion effectiveness of the breaststroke kick largely depends on whether the soles can fully turn outward (eversion + dorsiflexion). It is recommended to spend 5–10 minutes daily on seated ankle rotation exercises.

Kick rhythm training:
Use a kickboard for breaststroke legs only, deliberately pausing for 1–2 seconds after each kick to feel the body’s streamlined position during the glide before beginning the next tuck.

Dry-land practice in front of a mirror:
Simulate the breaststroke leg movement on land (standing or lying on your back), using a mirror or video to confirm the symmetry of both legs and the angle of sole rotation.

Conclusion

The choice of breaststroke kick style is not one-size-fits-all. The most suitable technique must be determined by combining an individual’s hip joint structure, training goals, and race distance. Recreational swimmers do not need to over-pursue a specific kick style. The most important thing is to ensure correct fundamental technique—synchronized kicking, full dorsiflexion, fast tucking, and streamlined gliding. These four elements are the true foundation of breaststroke efficiency.

Related Reading

• Biomechanics of the Breaststroke Leg Action: A Scientific Analysis of External Rotation and Propulsive Thrust
• The Relationship Between Breaststroke Pull Width and Speed: Finding Your Optimal Stroke Length
• Optimizing Breaststroke Kick Angle: Propulsion Differences Between Outward-Angled and Straight-Line Kicks
• Breaststroke Leg-Arm Coordination: Biomechanics of Glide Timing and Tuck Angle