Entrepreneurs striving to make their impact in the world may look at Sir Richard 
Branson, iconic entrepreneur and founder of Virgin Group, and be tempted to think
 that he has some special secret to credit for his success. However, if you’re looking
 for a productivity hack or the one book he read to change his life, you’ll be disappointed.
The secret to Richard Branson’s success and productivity is summed up in two words: “Work out.”
It’s as simple as that. Branson claims that exercise is the tool that helps him double
his daily productivity. When you exercise, you’re going to be mentally sharper, which
 leads to better decision-making throughout the day. Exercise also increases the
 amount of oxygen flowing into your brain and releases other chemicals that help
 improve your memory and concentration.