When you exercise, the physiological stress placed on the body by the activity can be measured using various markers in saliva and blood. Salivary cortisol, salivary a-amylase (pronounced alpha-amylase) and blood albumin are three such markers that health professionals can use to assess the psychological and physiological stress experienced. Typically, these markers are assessed via a sample of saliva and blood, which are then taken back to a laboratory and analysed using expensive and bulky equipment. However, small portable point-of-care devices are constantly being developed to make this process easier to conduct in the field. Our aim in this study is to test the reliability and validity of a device that might allow us to measure cortisol and a-amylase in the field more quickly than the laboratory methods.