It can get you hooked on exercise

If you've been looking for that elusive workout that will turn you into a regular exerciser, interval training may be it. In the interval walking study, every single participant kept up with the goal of four interval walking workouts a week for four months.

After nearly two years, they still averaged more than three workouts a week, an impressive stick-with-it rate for any workout program.

One reason: It can be fun to push yourself. Researchers have observed that people prefer high-intensity intervals and say they are likely to stick with routines that include them.