People who complain they have no time to exercise may soon need another excuse.
Some experts say intense exercise sessions could help people squeeze an entire week's workout into less than an hour. Those regimens - also called interval training - were originally developed for Olympic athletes and thought to be too strenuous for normal people.
But in recent years, studies in older people and those with health problems suggest many more people might be able to handle it. If true, that could revolutionise how health authorities advise people to exercise - and save millions of people hours in the gym every week. It is also a smarter way to exercise, experts say.
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"High-intensity interval training is twice as effective as normal exercise," said Jan Helgerud, an exercise expert at the Norwegian University of Science and Technology. "This is like finding a new pill that works twice as well ... we should immediately throw out the old way of exercising."
