I argue for an account of acting together that has a particular notion of joint commitment at its core. The account presented offers a compact explanation of four significant aspects of acting together as this is ordinarily understood: the parties have pertinent obligations to one another; each needs the concurrence of the rest with his or her untimely exit from the joint activity; an appropriate collective goal is sufficient to motivate the parties; and the parties may have personal goals contrary to the collective goal. I argue that the simplicity of the account coupled with its explanatory power argue for it in face of concerns that it takes us beyond the concepts we need to explain what it is for an individual to act alone. Indeed, there is reason to invoke joint commitment in many contexts other than acting together in which more than one person is involved. I conclude by noting that the joint commitment account of acting together plausibly accounts for the apparently transformative nature of doing things with others, citing its connection with a sense of togetherness, solidarity, and unity, as in the phrase ‘There is no I in team’.