This is a multi-site, one-arm type-2 hybrid-effectiveness implementation trial. The goal of this clinical trial is to learn if the Walk On! program helps prevent falls in older adults who have trouble moving around or feel socially isolated. Researchers want to know:

1. What are the best ways for organizations to offer the Walk On! program and keep it running for older adults in their community?
2. Does Walk On! help prevent falls in older adults?

Older Adult Participants will:

1. Join group walking sessions led by a trained facilitator
2. Meet twice a week for 12 weeks (24 sessions)
3. Take part in simple tests before and after the program to see if there are any changes in older adults' function, confidence in not falling, or loneliness.

Despite the clear benefits of walking for individuals at risk of mobility disability, no National Council on Aging (NCOA)-approved evidence-based health programs emphasize walking in a supervised setting, particularly over longer distances. While some programs offer chair exercise, balance, and yoga/tai chi, these do not focus on structured, progressive walking for older adults with limited mobility. Additionally, many older adults living in rural areas have described living in a "health desert" with limited access to evidence-informed health promotion programs.

Walk On! is designed to provide community-based walking for older adults who are physically, socially and/or geographically isolated. This includes a focus on older adults with existing functional limitations and/or mobility challenges that may otherwise limit one's participation in community-based programs and/or individuals who live in rural areas without easy access to safe walking spaces. An underlying goal of this project is to expand access to Walk On! by starting programs in new spaces and places across diverse service sectors.

In brief, Walk On! is a facilitator-led, group-based program consisting of 24 sessions (twice weekly for 60 minutes over a 12 week period) focused on improving walking endurance, strength, and balance for older adults, including those with mobility limitations. Walk On! program facilitators will receive comprehensive implementation support and training to guide their organization in successfully starting and sustaining a program of their own.

Objectives: The long-term goal is to support unique community-based organizations in adopting and sustaining Walk On!. To support this goal this project will evaluate the following objectives:

Objective 1: Evaluate the effectiveness of comprehensive implementation support on community-based organizations adoption and sustainment of Walk On!.

Objective 2: Evaluate the impact of Walk On! on older adults' physical function, falls efficacy, and self-reported loneliness.

Program Older Adult Participants: Inclusion Criteria:

• Age greater than or equal to 60 years
• Able to provide own transportation to the program each week
• No planned extended travel or time away during the 12 week program period
• English speaking with intact verbal and written communication skills
• Free of current fracture
• Able to ambulate independently, with or without an assistive device (i.e., cane or walker)

Program Participants: Exclusion Criteria:

• Serious or unstable medical or psychiatric condition that would prevent participation in research study
• Lack of decision-making capacity
• Participated in an evidence-based falls prevention program within the past 12 months

Community-Based Organizations (CBOs): Inclusion Criteria:

• Age greater than or equal to 18 years
• English speaking

Community-Based Organizations (CBOs): Exclusion Criteria:

• Not interested in offering a Walk On! program
• Unwilling and/or unable to participate in implementation activities