Just doing regular laps ensures a decent calorie burn and a good condition, but with this High Intensity Interval Training (HIIT) you go one step further.
Due to the pressure of the water, you do not have to fully support your body. Your joints are thus less stressed and you have less chance of injuries.
Have you just suffered an injury and are you recovering? Maybe swimming is something for you. In that case, don't just start training, but get advice from an expert.
In the December issue of Santé, swimming champion Madelon Baans gives exercises and tips for in the water.