This essay offers an account of feasible actions. It criticizes the conditional account of feasibility and offers instead what I call the constrained account of feasibility. The constrained account is superior, I argue, on account of how it deals with the problem of motivational failure to act and with collective action. According to the constrained account, roughly put, an action is feasible when the agent or agents performing it know how to perform it and are appropriately responsive to incentives. The essay shows that some collective requirements for action that appear feasible are not in fact feasible.