High-intensity interval training can enhance fitness, improve health and even aid recovery from heart disease, according to a growing body of compelling evidence. But, experts caution, intervals should not replace moderate exercise completely. Instead, the two types of activity can complement each other, offering more opportunities for getting fit and staying motivated.
“The more exercise options we can give to people is a good strategy,” says Martin Gibala, an exercise physiologist at McMaster University in Hamilton, Ontario. “Interval training is not a panacea.”