Lack of physical activity has been shown to increase disease and reduce life expectancy. In response, mobile devices are increasingly being used to support people's health and itness by tracking physical activity. Prior work shows that the type of feedback, either ambient or via notiication, affects users' behavior towards their physical activity. Yet, these phone- and watch-based interactions and notiications have primarily been visual in nature. Inspired by prior research, we explored the impact of feedback modality (visual, tactile, and hybrid: visual/tactile) on 44 participants' behavior and exercise mindset in a 6-week ield study. We present the differences between modalities and the notion of push vs. pull for interface feedback and notiications. Across 1,662 days of study data, we found statistically signiicant impacts of feedback modality and, in particular, the positive effects of push feedback on participants' mindset about the process of exercise. Our results also highlight design guidelines for wearables and multimodal notiication systems. © 2019 Copyright held by the owner/author(s).