The correct answer is option D: dopamine.
Dopamine is a neurotransmitter that plays a key role in the brain's reward system. When you exercise, your body releases dopamine, which can lead to feelings of pleasure and motivation. This release of dopamine is often referred to as the "runner's high" and can make you feel excited and eager to get started with exercise.
Here's why dopamine can make you feel excited to exercise:
1. Dopamine is associated with feelings of reward and pleasure, so when it is released during exercise, it can create a positive association with physical activity.
2. Dopamine can enhance motivation and drive, making you more likely to want to engage in exercise.
3. The release of dopamine during exercise can contribute to improved mood and overall well-being, which can increase your excitement about starting an exercise session.
In summary, dopamine plays a crucial role in making you feel excited to get started with exercising by promoting feelings of pleasure, motivation, and reward.