Answer:
The boy has a condition known as Achilles Tendonitis.
Step-by-step explanation:
The main tendon involved in this is the Achilles Tendon, this tendon is attaches your calf to the calcaneus or heel bone. When one does too much physical activity using this tendon like vigorous walking, jumping or running it results in the inflammation of that tendon. He probably has the specific type of tendonitis being the noninsertional Achilles Tendonitis. This is most common in young people.