The problem of self-knowledge has been thoroughly discussed in the context of traditional epistemology. In parallel to the traditional approach to epistemology, Radically Embodied Cognitive Science (RECS) has emerged in the last 30 years as a genuine contender in its field. According to RECS, the unity of analysis of cognitive processes is the dynamics between brain, body and environment. In this paper, I advance a RECS approach to self-knowledge, which immediately suggests that knowing oneself is a matter of knowing what (...) one’s body can do. I then turn to resistance training, particularly weightlifting, and argue that it offers a paradigmatic case of self-knowledge in RECS’s terms. More precisely, resistance training allows the trainee to achieve knowledge of themselves in a fundamentally practical manner—and doing so is transformative of the kind of actions they are capable of. (shrink)