This theses includes 4 case studies covering - (1)an examination of the anthropometric and physical characteristics of youth female team handball players (16.07 ± 1.30 y) in non-elite (n= 47), elite (n= 37) and top-elite players (n= 29); (2) a comprehensive analysis of team handball match play in youth English U18 Men’s National League players through the assessment of player movement demands, technical actions and heart rate during match play and secondly, the impact of team handball competition on fatigue during and after matches; (3) an investigation into neuromuscular fatigue and well-being of English handball players during a training camp and an international tournament; (4) the effect of two different interchange strategies on performance and pacing strategy during a simulated team-sports protocol.