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Physical Activity Research also indicates a key role for physical activity in obesity and being active protects against weight gain while an inactive lifestyle causes weight gain and obesity. Research also indicates that obese people walk less on a daily basis than non-obese people, are more sedentary during the week and on the weekend, and are less likely to use stairs or walk up escalators. Doing exercise can be predicted by beliefs and the environment. Research indicates that people exercise because they find it fun, for social contact, due to higher levels of self-efficacy to be healthy, because they have easier access to parks, cycle paths, or exercise facilities, and because it easily fits into their daily lives. Obesity is, therefore, caused by a combination of genetics, the environment, and psychological factors. This fits in with the biopsychosocial model and an integrated approach to understanding chronic illnesses. It also illustrates the role of psychology at the start of the continuum from health to illness.