Marijuana is the answer to this. Most people end up taking more serious drugs as a result of marijuana not being "hard" enough, or loosing it's effect. This is why it is called a gateway drug.
Uh can you give more details?
When you exercise, you lose electrolytes like sodium. They need to be replaced. That's why you drink fluids when you exercise. You lost electrolytes and you need to gain more.
Breakfast would be the correct answer due to it being the best and most important meal of the day!