**Exercise** refers to physical activity that is done for the sake of movement itself, typically to improve or maintain general health and fitness. It includes activities such as jogging, cycling, or doing a workout class. The primary focus of exercise is to engage in activity that promotes overall well-being, cardiovascular health, strength, and flexibility. It can be spontaneous or planned, but it doesn't usually have a long-term, structured progression or specific performance goals beyond improving general physical condition.

**Training**, on the other hand, involves a structured and systematic approach to physical activity with specific performance goals in mind. It is typically more focused and goal-oriented, often associated with athletes or individuals preparing for a particular event or achieving a defined objective. Training programs are designed to gradually increase intensity and complexity, with detailed plans and schedules that build towards peak performance. For example, a runner training for a marathon follows a specific regimen that includes varying distances, speeds, and rest periods to optimize endurance and performance.

An example of exercise is a person going for a 30-minute jog three times a week to maintain cardiovascular health. An example of training is an athlete following a 12-week program with incremental increases in running distance and speed to prepare for a competitive marathon.