How different would your day be if you had three extra hours to get things done?

Peter Shankman, author of "Faster Than Normal: Turbocharge Your Focus, Productivity, and Success with the Secrets of the ADHD Brain," can help with that.

On "Salon Talks," he offered four tips to increase daily productivity, and by his count, retain an additional three hours per day.

"The first rule is exercise," he told Salon's Alli Joseph. It's important beyond the physical component, he said, "you exercise, because exercise promotes dopamine and serotonin into your brain, which allows you to focus and be more productive."

"The second rule is the elimination of choice," Shankman said, which can include paring down your wardrobe. This rule is really about saving time by removing the time spent on insignificant decision-making.

"Rule three is eating healthy," he said. "And drink more water than Michael Phelps does."

"Finally, rule four, get as much sleep as you can," Shankman concluded. He strives for eight hours a night, and gets to bed as early as possible to ensure he feels rested and powerful come morning.