Table 1 Description of PA program characteristics and implementation according to randomization

Underlying philosophy/origin

School-based walking/running program promoting goal setting to encourage students to walk/run 100 miles over the school year. Core elements: offer ≥ 30 min per week, track miles

Enhanced elements: display mileage progress, offer incentives, hold special event (family fun-run, school-wide event, etc.)

Champions at schools delivered any program elements school-wide: Year 1: 5/7 schools Year 2: 3/7 schools

Classroom-based physical activity break program incorporating high and low intensity moves to be used throughout the school day. Core elements: offer daily break of ≥ 5 min, use activity cards most or all of the time Enhanced elements: integrate breaks with academics, use student leaders

Classroom teachers at schools delivered any program elements: Year 1: 6/6 schools (grades 3&4) Year 2: 6/6 schools (grades 3&4)

All Training (content, frequency, etc.)

Annual 30–40 min training offered to explain the program, assist with mapping routes, deliver program/tracking materials, bimonthly check-ins via email

Study staff provided training at schools: Year 1: 7/7 schools Year 2: 3/7 schools

Annual 10–20 min training offered to explain the program and deliver program guide and cards, bimonthly check-ins via email with newsletters to encourage engagement and implementation

Study staff provided training at schools: Year 1: 36/38 teachers trained Year 2: 12/42 teachers trained (some trained both years)

Materials/supplies provided

100 Mile Club program guide, clipboard box to assist with tracking in field, tracking posters, 1000 popsicle sticks for tracking laps

Study staff provided training at schools: Year 1: 7/7 schools Year 2: by request

CHALK/Just Move program guide and set of 24 activity cards

Study staff provided training at schools: Year 1: 38/38 Grade 3&4 teachers Year 2: 19/19 Grade 5 teachers; 4th grade teachers by request