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.
Continuous training is when an athlete exercises in a steady aerobic way and interval training is characterised by repetitions of work with a recovery period following each repetition. This can be broken down into the following sub-divisions that have slightly different effects upon the energy pathways.