A coach is able to create a training plan that is optimal for performance, motivation, and prevention of injury. Coaches are able to manage change to help their athlete prepare for their race. A great coach can evaluate your current fitness and develop a plan that will allow you to achieve your goals.
Most triathletes have busy lifestyles. Coaches will be able to provide the athlete with adjustments to their plan when life gets in the way. A coach is able to see factors that indicate appropriate progression, recovery, and adaptation that will lead to performance gains on race day.