Purpose CrossFit® (CF) is a high-intensity training method with a large number of practitioners, having an injury prevalence similar to other sports. Although excessive dynamic knee valgus is related to several injuries and associated with the trunk muscles` endurance and dorsiflexion range of motion (DF-ROM), no study has evaluated these parameters in CF practitioners. The aim of the study was to investigate the association between lower limb alignment during the step-down test, DF-ROM and lateral trunk muscle endurance in CrossFit® (CF) practitioners. Methods Forty-two CF practitioners performed the following tests on both limbs: (i) DF-ROM with the weight-bearing lunge test; (ii) knee frontal plane projection angle (FPPA) and hip adduction (hip ADD) ankle during the forward step-down test; (iii) trunk lateral flexors` endurance with the side plank test. Results No significant associations were found between knee FPPA and DF-ROM in both limbs (preferred: r = 0.192; p = 0.230; non-preferred: r = 0.089; p = 0.581) or side plank time (preferred: r = 0.086; p = 0.594; non-preferred: r = 0.248; p = 0.117). Moreover, no significant associations were found between hip ADD and DF-ROM in both limbs (preferred: r = 0.005; p = 0.975; non-preferred: r = 0.175; p = 0.275) or side plank time (preferred: r = - 0.134; p = 0.403; non-preferred: r = 0. 171; p = 0.284). Conclusion Lateral trunk flexors` endurance and ankle dorsiflexion range of motion are not associated with hip and knee kinematics during the forward step-down test in CrossFit®.
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