Objective To determine the reach and adoption of a coach-led exercise training programme for lower limb injury prevention. Design Secondary analysis of data from a group-clustered randomised controlled trial. Setting A periodised exercise training warm-up programme was delivered to players during training sessions over an 8-week preseason (weeks 1–8) and 18-week playing season. Participants 1564 community Australian football players. Main outcome measurements Reach, measured weekly, was the number of players who attended training sessions. Adoption was the number of attending players who completed the programme in full, partially or not at all. Reasons for partial or non-participation were recorded. Results In week 1, 599 players entered the programme; 55% attended 1 training session and 45% attended > 1 session. By week 12, 1540 players were recruited but training attendance (reach) decreased to
