A study with dairy calves was conducted to determine if exercise in a mixed terrain (grass, dirt and rocks) affects development of the digital cushion and pedal bones compared to less exercise in a grassy environment. Two-month-old animals were randomly placed into exercise and control groups. For 4 months, the exercise group was fed and watered at opposite ends of a half-mile long lane. Feeding was twice a day so the animals ran or walked briskly behind a feed truck 1 mile a day and walked leisurely to return to water 1 mile a day. After 4 months, the volume and surface areas of the digital cushion and the volumes of the short pastern and coffin bones were compared using magnetic resonance imaging and computed tomography.