Mental contrasting with implementation intentions (MCII) combines two simple and effective self-regulation strategies that have their roots in social psychology. When applied to exercise, MCII involves having individuals imagine positive outcomes associated with exercising more, the biggest obstacle to exercising more and achieving these positive outcomes, and practical solutions to the obstacle. Individuals create an “if-then” plan, which follows the structure “if (barrier), then (solution).” MCII has been effective at increasing exercise in the general population but has never been applied to those with mental health challenges as a stand-alone intervention.