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.
1 The Performance Interval Training technique is more advanced and is recommended for conditioned athletes. 2  This training method uses periods of maximum intensity (85% â 100% heart rate reserve) that usually last from 2-15 minutes, followed by lower intensity periods of the same or shorter duration.uring the intense periods of activity, interval training works repetitively on the aerobic and anaerobic systems. 1  The anaerobic system metabolises energy stored in the muscles (glycogen) for the short bursts of activity without needing oxygen.