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Sekulic, D, Krolo, A, Spasic, M, Uljevic, O, and Peric, M. The development of a new stop'n'go reactive-agility test. J Strength Cond Res 28 (11): 3306–3312, 2014—The main objective of this study was to evaluate the reliability and the validity of a newly constructed reactive-agility test that can be used to define the reactive-agility performance in sports that employ repeated scenarios of “stop'n'go” agility. Measuring is done by original hardware based on the ATMEL microcontroller AT89C51RE2. A total of 36 college-aged male athletes (age, 22.1±2.4 years; body height, 182.45±5.19 cm; body mass, 80.67±7.69 kg) and 21 college-aged female athletes (age, 21.4±2.5 years; body height, 171.45±6.81 cm; body mass, 61.95±6.70 kg) were evaluated for a stop'n'go reactive-agility test (SNG-RAT), stop'n'go change of direction speed (SNG-CODS), countermovement jump, and anthropometrics. The reliability analyses …