The science of exercise and happiness
Human Health and Behavior
Ian Perez
- Grade:
- 7
- Teacher:
- Lauren Dineen
In this experiment I want to determine whether engaging in physical exercise increases endorphins levels and leads to improved mood.

Congratulations on a very insightful project! Your research into the role of endorphins—the brain’s natural ‘feel-good’ chemicals—provides a strong scientific basis for your experiment. I was particularly impressed by your use of a 10-subject trial and your honest observation that while the average mood improved significantly (8.09), individual results varied.
It was great to see you acknowledge that the type of exercise matters; if a person enjoys the activity (like running vs. weights), the mood boost is often higher.
This project explores the connection between exercise and mood, which is an important topic for both physical and mental health. I like that the experiment included a control group and a test group, since that makes it easier to compare how exercise influenced mood ratings. The use of a simple rating scale allowed participants to express how they felt after exercising, which helped reveal clear differences between the groups. It was interesting to see that most participants reported higher mood scores after exercise, which supports the idea that physical activity can make people feel better. One suggestion would be to track the results over a longer period of time or compare different types of exercise to see if some activities improve mood more than others. This investigation highlights how everyday habits like exercise can have a meaningful effect on emotional well being.
This project examines the relationship between exercise and mood, which is a meaningful topic for understanding mental and physical well being. I appreciate that the experiment compared a control group with a group that exercised, because that makes the difference in mood easier to see. The use of a rating scale allowed participants to express how they felt after exercising, which helped show a clear change in mood levels. It was interesting to see that many participants reported feeling better after physical activity, supporting the idea that exercise can positively influence emotions. One suggestion would be to run the study for a longer period of time or compare different types of workouts to see if some activities improve mood more than others.