Many sports rely on the consistent performance of a variety of different balls undergoing repeated impacts. The design of these balls, and our understanding of the implications for the objects the interact with (e.g. bats, rackets, playing surfaces, human body parts, protective equipment for human body parts), relies on computational analysis backed up by experimental evaluation of impact phenomena. Recent and proposed advance in these areas will influence the rules and regulations in sport, but also a broader understanding of other impact scenarios in the years to come. This PhD is a career launching opportunity to make a significant contribution to international developments in ball, sports equipment and human impact research.