The Science of Swimming

What It Covers

Competitive swimming has seen dramatic performance improvements over the past century, with men's 100m freestyle times dropping 13 seconds since 1924. Technological advances in swimsuits, pool design, and technique innovations like the underwater dolphin kick explain these gains far more than basic human advancement.

Key Questions Answered

• •Swimsuit Technology: Wool swimsuits absorbed water and created drag until nylon suits emerged mid-century. Polyurethane suits at the 2008 Beijing Olympics broke 25 world records by increasing buoyancy and reducing skin exposure, prompting World Aquatics to ban non-textile materials to preserve competitive fairness and prevent doping-equivalent advantages.
• •Pool Engineering: Modern Olympic pools use 10 lanes instead of 8, creating buffer lanes that absorb waves from end swimmers. Depths of 3 meters prevent water reflection off the bottom, while overflow gutters kill surface waves before they start. These changes reduce drag and turbulence that slow competitors down.
• •Underwater Dolphin Kick: David Birkhoff spent most of his 100m backstroke underwater at the 1988 Seoul Olympics, breaking the world record with this technique. The undulating motion converts core power into forward propulsion with less drag than surface swimming. World Aquatics now limits underwater swimming to 15 meters per turn.
• •Flip Turn Mechanics: Al Vandeweg introduced the flip turn at the 1934 AAU National Swim Meet, performing a 180-degree somersault into the wall. This technique maintains momentum through direction changes and conserves energy compared to stopping, turning manually, and pushing off, giving swimmers measurable time advantages at each wall.