AbstractThe level of development of motor skills in children aged 3-6 years has a significant impact on their lifelong level of physical fitness. The purpose of this study was to establish a holistic model of physical fitness development in children aged 3-6 years old and to evaluate the effect of a customized physical fitness intervention plan based on this model. Systematic review and meta-analysis were used to determine current weaknesses in fundamental skills intervention program, which validated the model used _Children Sports Ability Training (CSAT) Model_. The customized fitness program based on the model were then used by a total of 545 children aged 3-6 years old in an early childhood fitness centre in Chengdu, China as part of their curriculum. During the period, motor skills were assessed at pre and post using Peabody Developmental Motor Scale-2 (PDMS-2). The meta-analysis result showed that 92% intervention program only utilized gross motor skills from 2013-2023. Profiling assessme.....