This module contains materials and activities for teaching undergraduate students about the thermal physiology of reptiles and amphibians. The module begins with an interactive lecture introducing the topic of thermoregulation and the importance of temperature to reptiles and amphibians, followed by an activity for hands-on learning. The second part of the module contains an interactive lecture introducing the thermal dependence of physiological traits in reptiles and amphibians, followed by another hands-on activity for linking ideas from both lectures with thermoregulation, behavior, and fitness. The final part of the module is a hands-on activity which tests the ability of students to think critically and link all concepts presented. I have included the presentations and materials for in-class activities and assignments.