Puszczałowska-Lizis, E., Musiał, S., Lis, K., Pociask, K., & Placek, K. (2017). Life satisfaction and motives undertaking of physical activity by women aged 50-55 engaged in the fitness club. Health Promotion & Physical Activity, 1(1), 87–95. https://doi.org/10.5604/01.3001.0010.7596