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.
Steady state training has its place in any workout routine, but a dose of interval training may be just what you need to rejuvenate your workouts and boost your fitness. Athletes have been using interval training for years to increase performance, but you don't have to be an elite athlete to get the benefits in your own training.