Volunteers are wanted by the University of Bristol to take part in a study that involves 30 minutes of walking a day.
The project will examine the effect walking has on the fitness levels of individuals who do little or no exercise.
The men or women aged between 18 and 65 must be in relatively good health and live in the Bristol area.
Over six weeks, participants will be asked to progress from three 10 minute walks a day to one 30 minute session.
Ronan Doherty, from the University, said: "It is hoped that by taking part in this study people will realise that you don't need to pay expensive gym membership or buy expensive sports equipment to improve your fitness.
"Simply by increasing your physical activity levels through walking more, you can protect yourself from diseases such as heart disease and diabetes."