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Volitional help sheets use Gollwitzer's (1993) concept of implementation intentions as a vehicle to change behaviour using Prochaska and DiClemente's (1983) processes of change. The present study designed and tested a volitional help sheet to increase physical activity in a group with low socioeconomic status (low-SES). Sixty-eight people (33 women, 35 men; mean age 27) with low-SES were randomly allocated to either an experimental group or a control group. Both groups received a questionnaire and a volitional help sheet; the only difference between the experimental and control groups was that the former were given explicit instructions to link occasions on which they were tempted not to be physically active with appropriate behavioural responses (processes of change). Physical activity (Metabolic Equivalent minutes per week) was the main outcome measure; behavioural intention and self-efficacy were …