<span> HERES FIVE FACTOR THAT HAS THE GREATEST IMPACT ON FLEXIBILITY? 1.Joint structure. There are several different types of joints in the human body. 2.Age & Gender.ROM and flexibility naturally decreases as you get older. 3.Connective Tissue.Deep connective tissue such as fascia and tendons can limit ROM. ... 4.Muscle bulk 5.Proprioceptors.