The lesson contains many resources to choose from. Changes during exercise or Why exercise are two of the starters teachers could choose from to engage students in this lesson. This is then followed by students gaining an understanding of keywords such as breathing rate, heart rate and breath volume which are later used in describing the observable changes during increased exercise. This is followed by students carrying out an investigation into pulse rate before, during, and after exercise. This investigation is then consolidated by calculating percentage change between resting and exercising pulse rate readings, explaining results recorded and a multiple choice plenary and exam questions that may be set for homework or extension questions. Mark schemes are also available for all activities in the lesson.