This study aimed to determine the factors that influence the behavior of the elderly in participating in gymnastics for elderly in Jalan Gedang Health Center in Bengkulu City, 2016. This study was an analytical study using cross sectional design. The population were all elderly at gymnastics in Jalan Gedang health center totaled 50 people, with a total sample of 33 people, and were taken using accidental sampling technique. Data collection was done by direct interview using a questionnaire. The data were analyzed using univariate and bivariate analysis with chi square test at α 5 percent. The results showed that most respondents 60.6 percent had less knowledge, most respondents 51.5 percent got lower family support, almost half of respondents 36.4 percent had low motivation, almost half of respondents 42.4 percent behave not active in participating in gymnastics for elderly, and the results of the chisquare value of ρ 0.040, 0.000 and 0.001 showed no relationship between knowledge, family support and motivation to the behavior of the elderly in participating in gymnastics in Jalan Gedang health center in Bengkulu City 2016. Knowledge, family support, and motivation are very important for the elderly in order to follow gymnastics actively, because gymnastics is very useful for maintaining health. Keywords: Awareness, Behavior, Family Support, and Motivation