While you don’t want to spend too much time developing your kick, having a weak, inefficient kick or over kicking will cost you in a race.

Swim start at Ironman Arizona.

The kick does two things: it assists in propulsion and position. In distance swimming (and, whether you’re racing a sprint or a full Ironman, you’re engaged in a distance swim) you want the focus of your kick to be on position. A strong position in the water ensures your stroke will be more effective and less energy will be required to pull yourself through the water. Your kick needs to keep you level and high in the water.

You might say that your wetsuit achieves the same result, which is right. But, with just a small amount of energy from an efficient kick, your position will be that much better. It will also help with your rotation, which you need whether you’re in a wetsuit or not. And, besides, you may not want to limit yourself to wetsuit races only.

Wetsuit swim. Photo: Brad Reiter

Related: Open water swims across Canada

A big kick should be treated like a nitro button on a street rod. You unleash it with discretion and only for short periods of time to increase your speed. For pros, and anyone trying to podium in their age group,

getting into a good pack right from the start is important. Also, from time to time, you may need to accelerate to bridge a gap, to get your pace back up after a buoy or to drop a competitor. Kicking harder for a while is necessary, but it comes with a cost, taking some much-needed energy you might need later in the race. If your kick is weak, the cost is even higher.

For the triathlete who is simply hoping to get to the finish line with some dignity, employing a smooth steady kick that optimizes your position in the water is the way to go. The exception is when you’re within a few minutes of the finish. Increasing the vigour of your kick will warm the legs up a bit, which helps when you jump on your bike.

The swim at Ironman 70.3 Zell Am See. Photo: Jan Hetfleisch/Getty Images for IRONMAN)

Kicking does more than just help you swim more efficiently, too. It’s a fantastic, non-impact way to strengthen the connective tissues in the knees and hips. It also works the core and quads in ways specific to the sport.

You should dedicate about 10 per cent of your swim workouts to kicking. A person with a strong kick can maintain that strong kick with less, but a swimmer with a weak kick may need to spend a little more time getting their kick strength up.

Proper Technique

  1. Keep your toes pointed, which requires flexible ankles. If you’ve got stiff joints, fins can increase your range of motion. Dryland stretching, by sitting on your feet and gently leaning back, can also help.
  2. Make sure your kick originates from the hips – not the knees. Bend your knees slightly in the upstroke of the kick, but keep them firm on the downstroke. Keep your kick from flaying too wide – imagine kicking inside an imaginary bucket.
  3. When I see a swimmer with a wide scissor kick, or a foot that shoots out of the water with regularity, it’s a safe bet that they’ve got something going on at the front end of their stroke that needs attention. A hand entry that’s too wide or a cross- over are the most likely instigators. Sometimes a product like “Swim Kik Fix” will force the swimmer to address the stroke problem, but more often than not you need to tackle the source of the issue.
  4. Kicking with a snorkel and no board, or a very small kid’s board, will help promote a better position. Using pull buoys as a kickboard works well, too.
  5. Think of “boiling the surface of the water with your feet,” but don’t let your feet come out of the water. There is neither propulsion, nor position, to be found above the surface of the water.

Work your kick during training, then use it sparingly while racing. Remember, you have to bike and run after swimming. Starting the swim with a weak kick will mean weaker legs for the next two events.

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