While biosensing is becoming a popular tool among urban geographers to address the emotional experience of the urban environment, it is also posing significant challenges, as its application demands expertise on technology and human physiology that is not part of regular curricula in geography courses. Despite this, there is little exploration of how to teach biosensing to urban geography students. This paper responds to this gap by exploring how undergraduate urban geography students respond to the introduction of biosensing techniques in urban geography fieldwork. Empirically, we draw on two case studies in a European (Warsaw, Poland) and a South American (Cuiaba, Brazil) context. Our findings show how the introduction of biosensing leveraged a greater engagement with the body-environment relation in urban space, but also sparked a series of technical, methodological, and analytical challenges for students. With this, we contribute to current knowledge on the introduction of mobile technologies in geographical fieldwork. We conclude the paper by providing recommendations for biosensing training for geographers and future research paths on this topic.