Participants in this study will be randomly assigned to one of two groups. Both groups will continue their regular medications and treatments throughout the study. Upon entry, members of both groups will complete the same two forms concerning attitudes toward exercise. Group 1 participants will attend weekly 1-hour exercise information sessions for 4 weeks. Group 2 participants will attend weekly 1-hour general health information sessions for the same 4 weeks. Participants of both groups will then take part in identical 16-week walking programs. The walking program will consist of three 30- to 50-minute walks per week, including 10 minutes of warm up and 10 minutes of cool down stretching. All participants will gradually increase their walking time from 5 minutes to 30 minutes during the program. At the completion of the walking programs, participants of both groups will complete repeat forms about their attitudes toward exercise. There will be no follow-up visits for the participants.