Citation: Chekroud, S., Gueorguieva, R., Zheutlin, A., Paulus, M., Krumholz, H., Krystal, J., & Chekroud, A. (2018). Association between physical exercise and mental health in 1-2 million individuals in the USA between 2011 and 2015: A cross-sectional study. The Lancet Psychiatry, 5(9), 739-746. Link to publisher’s article.