Sales is a demanding profession. Top performers know that to sustain a high level of performance, they need to keep fit and well – both physically and psychologically. And there’s a body of research showing that keeping an optimistic outlook and having the physical energy to meet the demands of working in sales are critical to a salesperson’s effectiveness, success and overall well-being. Something many of us know intuitively, but good to have it validated.

Managing and overcoming setbacks is key to succeeding in anything. In sales we are tested every day. Without a sense of optimism it would make getting …