Background This study examined the effects of a 24-week functional training (FT) and blood flow restriction combined with FT (BFR-FT) on athletic performance and body composition in athletes. Methods Twenty-six male basketball players were randomly assigned to either the experimental group (EG) or the control group (CG). The CG performed FT, while the EG performed BFR-FT, both for 24 weeks. Assessments were conducted at seven time points, every 4 weeks, measuring 1RM half-squat, 1RM squat, verti