Supplementary files

From October 1st, 2023, literature searches were conducted until December 2023, using five well-known electronic databases to systematically search for articles related to the topic: Web of Science, PubMed, Scopus, EBSCOhost, and Cochrane Library. The Boolean search syntax of operators "AND" and "OR" was used to search for relevant literature on the impact of high-intensity functional training on the physical fitness of healthy males. The main keywords searched are: The key words are ("high-intensity functional training" OR "high-intensity functional exercise" OR "functional high-intensity interval training" OR "CrossFit") AND ("physical fitness" OR "physical endurance" OR "cardiorespiratory fitness" OR "physical condition" OR "body composition" OR "airborne endurance" OR "endurance" OR "strength" OR "speed" OR "power" OR "agility" OR "balance" OR "coordination" OR "flexibility" OR "reaction time") AND ("male" OR "boy" OR "men" OR "individual"). In addition, we manually searched for references and Google Scholar to prevent omissions in relevant articles as much as possible.