Table 1. Physical characteristics in mean (standard deviation). Intervention group Control group All (n = 11) Female (n = 5) All (n = 9) Female (n = 7) Age (years) 17.5(2.9) 16.8 (2.0) 15.9 (1.1) 15.6(.8) LBL (m) 1.71 (.09) 1.66 (.03) 1.73 (.06) 1.70 (.03) RH (m) 2.18 (.11) 2.11 (.03) 2.21 (.11) 2.17(.08) BM (kg) Pre 58.9 (10.2) 53.4 (3.1) 58.3 (6.6) 56.3 (5.7) Post 59.5 (10.1) 53.6 (3.0) 59.7 (6.9) * 57.4 (5.8) LBL: lying body length, m: metres, RH: reaching height, BM: body mass, kg: kilograms. * Significant change in group at p < 0.05.