RecruitingBehavioural interventionHARP Mindfulness StudyThis study was designed using the Multiphase Optimization Strategy (MOST) framework to determine whether two supplemental components increase the efficacy of a mindfulness-based cognitive therapy program delivered via telephone (MBCT-T) for psychological distress. Specifically, this study will test mindfulness booster sessions to follow a standard 8-week MBCT-T intervention, as well as website support in patients with heart disease and/or heart disease risk factors.