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.
If you are new to interval training, try this workout twice a week in place of your regular run for four weeks. After four weeks you can increase the interval length to two minutes. Always remember to warm up and cool down adequately. Warm up for 10 minutes at an easy jog.