Inclusion Criteria:  Self-identification as Hispanic or Somali. Member of a social network identified in the social network analysis. Willingness to participate in all aspects of the study. Provision of informed consent.  Exclusion Criteria:  Pregnancy at the time of enrollment. Serious medical conditions or disabilities that would make physical activity difficult. To avoid stigmatization, a normal weight (BMI<25) will not exclude individuals from participating in the intervention, but they will be excluded from the measurements and analyses.