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This research project aims to answer the key research question: “To what extent are changes in early and peak lower-body isometric performance associated with changes in sprint, jump and change-of-direction (COD) (henceforth referred to as explosive lower body actions, or ELBA) performance after training interventions?” Its secondary aim is to identify whether this association is moderated by age, sex or training intervention. To answer these questions, a systematic search for all peer-reviewed training studies, of at least four weeks duration, which employed isometric and ELBA assessment pre- and post- intervention, will be conducted. Results from the selected studies will be meta-meta-analysed to identify the level of association between changes in isometric performance and changes in ELBA performance, and whether moderating effects exist for age, sex or type of training intervention. This work builds upon that of James et al. (2024), who showed with meta-analysis that changes in lower-body isometric strength are not associated with changes in lower-body dynamic strength. Given that changes in isometric performance are not associated with changes in dynamic strength, and there is less dynamic correspondence between isometric tests and ELBAs than isometric tests and dynamic strength, it is hypothesised that no statistically significant relationship will exist between changes in isometric performance and ELBA performance, regardless of age, sex or intervention type.