The issue focused on about 12 different components of human behaviour: climate change, communication, exercise, alcohol and drugs, exercise and exercise science, exercise and exercise science and exercise (data). We compared them with each other and with data from other sources to gain an understanding of their links and impact on health and fitness. We found that these factors were highly interrelated and there was no single factor that caused all of them. For example, climate change was linked to low physical activity and poor eating habits. Also, factors