Cowley, E., Watson, P., Foweather, L., Belton, S., Mansfield, C., Whitcomb-Khan, G., Cacciatore, I., Thompson, A., Thijssen, D. and Wagenmakers, A. 2021. The formative evaluation of The HERizon Project randomised controlled trial - a home-based physical activity intervention for adolescent girls: Oral Presentation B9.1. The Health & Fitness Journal of Canada. 14, 3 (Sep. 2021). DOI:https://doi.org/10.14288/hfjc.v14i3.543.