In the Milky Way, about 1 in 5 stars that are like our sun in size, color and age have planets that are roughly Earth's size and are in the habitable zone where life-crucial water can be liquid, according to intricate calculations based on four years of observations from NASA's now-crippled Kepler telescope.
Varying Incline. Varying the incline is another option for interval training using a good treadmill. Exercisers that want to vary the incline for interval training should still start with a warm up period, which should be a walk or slow jog at an incline of 1.0.
Image Source: Thinkstock. Interval training is the ultimate fitness mash-up, blending the speeds of both the tortoise and the hare. All the benefits of this training are enough to motivate you to pick up your pace and head to the gym now. Keep reading to learn why you should play with intervals.