Anonymized participant-level datasets for the squat variables of the project "Effects of Caffeine Ingestion on the Biomechanics of Healthy Young Subjects" (NCT06039358). The purpose of the dataset is to provide FAIR data on the impact of caffeine on performance and technique while squatting in different variables. Each variable can be found on a different sheet of the Excel document. There are 14 subjects per variable, and each of them is analyzed in a control, placebo, and caffeine session, with and without fatigue.