Power is achieved in the shortest and most intense bouts of exercise. (fitbodyhq.com)
You can burn tons of stubborn fat by using short, intense bouts of exercise, for example 10 - 15 minutes of 30 - second sprinting with 30 seconds of rest in between. (fitnessandpower.com)
Thus, people with high lifestyle stress will release more cortisol during an intense bout of exercise as compared with someone who has a lower stress level. (personalfitnessadvantage.com)