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.
Continue at a steady pace for as little as 20 minutes or as long as an hour, depending on your training needs that day. You can incorporate steep uphill treadmill walking into your training in a number of ways. One option is to do it once a week as a recovery workout, perhaps the day after a long run, as an alternative to taking the day off.