Kujawska, A.; Perkowski, R.; Androsiuk-Perkowska, J.; Skierkowska, N.; Gajos, M.; Topka, W.; Kujawski, S.; Kędziora-Kornatowska, K. Physical Activity in Healthy, Older People. How Many Drops of Sweat Away from Gain the Health Benefit?. J Educ Health Sport 2017, 7, 412-422.