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Styles, WJ, Matthews, MJ, and Comfort, P. Effects of strength training on squat and sprint performance in soccer players. J Strength Cond Res 30 (6): 1534–1539, 2016—Researchers have demonstrated that increases in strength result in increases in athletic performance, although the development of strength is still neglected in some sports. Our aim was to determine whether a simple in-season strength training program would result in increases in maximal squat strength and short sprint performance, in professional soccer players. Professional soccer players (n= 17, age= 18.3±1.2 years, height= 1.79±0.06 m, body mass [BM]= 75.5±6.1 kg) completed 1 repetition maximum (1RM) back squat and sprint tests (5, 10, and 20 m) before and after a 6-week (× 2 week) in-season strength training (85–90% 1RM) intervention. Strength training resulted in significant improvements in absolute and relative strength (before …