Ratchet up your workout with a rest [news]
If your cardio routine is in the doldrums, try mixing a little tortoise in with that hare.
Experts say interval training, alternating bursts of intensity activity with less intense periods, can burn more calories, boost stamina, and stave off that burning pain that stops any workout dead in its tracks.
"Interval training burns calories quicker. If you're doing interval training for 20 minutes it can burn as many calories you would in 40 minutes," said Kerri O'Brien of Life Fitness, which designs and manufactures exercise equipment.
"It depends on level of intensity, the weight of your body, the intensity of what you're doing," she added.