This Physical Education and Health activity can be used in the P.E. setting as well as in the Health setting. It has been used with students at the Second through Fifth grade level and can easily be modified for older students. This is a great cardiovascular activity that the students actually enjoy. They all leave breathing hard and red faced! Students work to improve their cardiovascular endurance and can check their heart rate along with learning Circulatory System Concepts. Circulatory Double Down also works on communication, trustworthiness and sportsmanship skills. Students will learn about deoxygenated blood, oxygenated blood and cholesterol. This activity was created by Heather Isler. Teaching the Circulatory System in P.E.: Circulatory Double Down is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.