Approximately one in every two people who begin an exercise program quit within the first six months, according to some estimates. Why is it so challenging to stick to regular workouts? “Declining motivation is usually the main culprit,” says Vijay Daryanani, a certified personal trainer with Harvard-affiliated Spaulding Outpatient Centers at Marblehead Jewish Community Center and Marblehead YMCA. “People understand the importance of regular exercise and can be excited to begin, but staying