Current study focuses on ageing men diagnosed with prostate cancer receiving androgen deprivation therapy (ADT), a form of chemical castration conducted to slow down tumour growth.  The treatment usually brings a spectrum of side effects, such as lack of libido, erectile dysfunction, gynecomastia, sarcopenia and increased body fat around hips. Socially, these side effects may have a negative effect on treated men’s sense of self, not being able to live up to traditional masculine norms and values. This paper investigate how anticipated ADT side effects can be countered and dealt with through physical activity.  The aim was to analyse how participants experienced and embodied physical activity when participating in an exercise programme in relation to ageing, illness and masculinity. Data were collected through both focus and individual interviews with 10 men aged between 65 and 79. Theoretically the study combined ideas about the habituated body with the notion of hegemonic masculinity, analysing processes of both ageing and ADT treatment as a form of precarious embodiment. Preliminary findings suggest that the ageing and ill body evoke a sense of unfamiliarity. Participation made it possible for the men to rediscover their bodily capacity and felt more assured when regaining key abilities related to the notion of masculinity. The men found motivation attending the exercise programme in the opportunity to meet others in the same situation and the group constellation was significant to the men as it promoted an inclusive environment, creating a sense of fellowship. Physical activity could therefore have the capacity to reinforce individuals on different levels.