Can a phone app help young cancer survivors get healthy?

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Current age 18-39 years at the time of consent * Diagnosed with invasive cancer malignancy between the ages of 15-39 years * Diagnosed with invasive malignancy in the last 10 years of diagnosis, and with no evidence of progressive disease or second primary cancers * Completed active cancer directed therapy (cytotoxic chemotherapy, radiation therapy and/or definitive surgical intervention), except may be receiving "maintenance" therapy to prevent recurrences * No pre-existing medical conditions(s) that preclude adherence to an unsupervised exercise program including cardiovascular disease, congestive heart failure, pulmonary conditions, renal disease, and severe orthopedic conditions * Not currently meeting guideline recommendations of 150 minutes/week moderate to vigorous physical activity (self-report) and guideline recommendations for fruit and vegetable consumption (self-report) * Have the ability to read, write and speak English * Have access to the Internet on at least a weekly basis * Possession and usage of an Internet e-mail address or willingness to sign up for a free email account (e.g., gmail) * Have smartphone with internet access and text messaging plan * Be willing to be randomized to any condition Exclusion Criteria: * History of heart attack or stroke within past 6 months * Untreated hypertension, hyperlipidemia, or diabetes, unless permission is provided by their health care provider * Health problems which preclude ability to walk for physical activity * Report a diagnosis of psychiatric diseases (schizophrenia, bipolar disorder, depression leading to hospitalization in the past year), drug or alcohol dependency * Report a past diagnosis of or treatment for a Diagnostic and Statistical Manual of Mental Disorders (DSM-IV-TR) eating disorder (anorexia nervosa or bulimia nervosa) * Plans for major surgery (e.g., breast reconstruction) during the study time frame * Current participation in another physical activity or weight control program * Currently using prescription weight loss medications * Currently pregnant, pregnant within the past 6 months, or planning to become pregnant within the next 6 months * Currently exercising \> 150 minutes/week of moderate-to-vigorous intensity physical activity * Currently consuming \> 5 servings of fruits and vegetables/day.