The Test of Gross Motor Development--Second Edition (TGMD-2) is a widely used evaluation tool of children's fundamental motor skills (FMS). This study illustrates how exploratory structural equation modeling (ESEM) addresses current limitations associated with TGMD-2 factor structure. Using the normative dataset from the TGMD-2 manual, we test alternative measurement models using ESEM and confirmatory factor analysis (CFA) and assess measurement invariance between boys and girls and across age. Findings highlight complexity and poor discriminant validity in the two-factor solution that is accentuated when relying on CFA independent clusters assumption. Results also demonstrate differential item functioning (DIF) across age for three of the 12 TGMD-2 indicators. Taken together, this study provides valuable information on the need to reevaluate the TGMD-2 factor structure and can guide revisions for the third edition of the TGMD.