The goal of this behavioral research study is to find out more about the health behaviors of cancer survivors. Researchers want to understand the cultural, social, and environmental factors related to physical activity and personal diet. Researchers also want to learn if cancer survivors who take part in lifestyle interventions have better overall health and quality of life than those who do not take part in these interventions.

If you agree to take part in this study, you will have a baseline study visit. This visit will include a physical exam, including measurements of your height and weight. Your hips, wrist, mid-arm, and waist will also be measured. You will also fill out questionnaires that contain items about your diet and exercise habits as well as questions about your quality of life.

Study Groups:

You will be randomly assigned (as in the flip of a coin) to 1 of 2 groups.

• Group 1 will take part in an exercise intervention program.
• Group 2 will take part in a sedentary behavior and dietary intervention group.

Group 1--Exercise Intervention:

At the baseline study visit, the study staff will show you how to complete the physical exercises you will perform while you are on study.

You will receive a pedometer that you can wear on your waistband to track your physical activity. The pedometer is the size of a deck of cards and will be worn throughout the study to track your progress.

You will be given resistance training bands to use as part of the home-based exercise program. At the baseline study visit, you will receive a directions on how to use the study website. In addition, the study coordinator will walk you through each of these exercises. After the study is complete, you will be allowed to keep the resistance training bands and pedometer.

Participants in Groups 1 will receive access to a website that will allow you to track your exercise behavior and help you set goals. This data will be recorded for you, and your progress will be graphed throughout the course of the study.

You will be given access to an internet-based curriculum that will help teach you about goal-setting, overcoming barriers to physical activity, self-management strategies, and time-management skills. You are being asked to visit the website every week to read that week's lesson materials and to set weekly goals. In addition to this weekly visits, you will need to record your activity and the number of steps you take every day on the website. Each month, you will be asked to fill our a survey about your attitudes and beliefs about physical activity.

Group 2--Parallel-Study Group:

Participants who are assigned to this group will received access to the same website as Group 1. You will also be asked to read information about improving the quality of your diet and cutting back on sedentary behavior ( for example, television viewing and overall sitting). The website will allow you to track your sitting and dietary behaviors and help you set goals. This data will be recorded for you, and your progress will be graphed throughout the course of the study.

Participants in Group 2 will be given access to curriculum that will help teach you about goal-setting, overcoming barriers to improving your diet and cutting back on sedentary behavior, as well as learn self-management strategies and time-management skills. You are being asked to visit the website once a week to read that week's lesson materials and to set weekly goals. In addition to this weekly visit, you will need to record on the website how much television you watch and how many fruits and vegetables you eat every day. Each month, you will be asked to fill our a survey about your attitude and beliefs about sedentary behavior and dietary intake.

6-Month Follow-up Visit: For both groups (Groups 1 & 2), at the 6-month follow-up visit, your weight and waist, hip, and arm measurements will be recorded and compared to your measurements from the baseline visit.

Length of Study:

For both groups, you will be taken off study if you experience side effects from taking part in the intervention, you are hospitalized for any reason, or you are diagnosed with a condition that needs a treatment not allowed while on this study.

Your participation on the study will be over once you have completed the 6-month visit.

This is an investigational study.

Up to 200 cancer survivors will take part in this study. Up to 150 will be enrolled at MD Anderson.

Inclusion Criteria:

1. 18-80 years old at diagnosis
2. diagnosed with operable invasive cancer
3. have access to high speed internet
4. Phase 2 only: be currently sedentary (i.e., engage in < or = 60 minutes of purposeful moderate-intensity PA/week)
5. Phase 2 only: be overweight or obese (i.e., have a body mass index (BMI) > or = 25 kg/m^2)
6. speak English

Exclusion Criteria:

1. watch less than 3 hours of television per day
2. be currently enrolled in another intervention study or recently completed a study promoting healthy lifestyle behaviors (diet and/or exercise)
3. participants answering 'Yes' to one or more of the questions on the physical activity readiness questionnaire (PAR-Q) will need to obtain approval from a physician before they can participate in the intervention.