This report outlines a database search conducted using CINAHL to investigate the effects of High Intensity Interval Training (HIIT) on cardiovascular fitness in adult males. The search strategy involved formulating a PICO question (Does high intensity interval training improve the cardiovascular fitness in adult male?), selecting relevant keywords (Male, High Intensity Interval Training, Non-high intensity interval training), and applying filters such as publication date and source type to refine the results. The most effective search strategy yielded a specific journal article addressing the clinical question. Alternative search options and their outcomes are also presented, along with reflective questions on the database's utility and user-friendliness. The report concludes with a list of references supporting the findings.