This is a very active, hands-on, and competitive lab (with surprising results!) that compares the amount of testosterone in ones' body with their competitive nature. I was inspired to write this lab after watching this video: http://www.youtube.com/watch?v=ecd43CQo7xU
I usually show this video AFTER the lab has been done and it either confirms or negates the classroom results. This lab has students talking months after it is done! You will need a hallway, outdoor area of gym for students to run and a stopwatch.