It's compatible with many health conditions

It's always a good idea to check in with your doctor before starting a new workout routine, especially if you have an ongoing health condition. But many studies have concluded that intervals can be safe and beneficial for people with diabetes, heart disease and more.

In one study, people with heart disease who alternated between fast and slow pedaling on an exercise bike (20 and 40 seconds, respectively) improved how fast their heart rates slowed to normal after exercise. This is considered an important marker for longevity.