Answer:
Matthew is dehydrated. He must treat this by drinking liquids, such as water or an isotonic drink.
Explanation:
The physical exercise that Matthew is practicing, already promotes the loss of fluids from his body. When he decides to practice this exercise in a high temperature environment, the loss of fluids is even greater, requiring Matthew to replace these fluids if he does not want to be dehydrated. However, he did not take any fluids with him, which caused his body to lose excess fluids through sweat and cause uncomfortable symptoms such as the throbbing pain in his legs.
To treat this, Matthew must drink fluids constantly.
