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.
Weight training: In a sense, this is just another form of interval training. You increase your heart rate during reps and recover between sets. By efficiently handling the demands placed upon them, strong muscles ease the overall burden on the heart. Use free weights, which recruit more muscles, engage your core, and build balance.