Act.Fit Application of Adult Physical Fitness Measurement in Indonesia Actuar. Aplicacin Fit De La Medicin De La Aptitud Fsica Del Adulto En Indonesia

This research is part of development research using the Borg and Gall method and the development method. The expected goal of this research is to develop an Android-based "Act.Fit" application that allows adults to measure physical fitness independently, test the validity and reliability of physical fitness measurement instruments through an Android-based application "Act.Fit". The steps for developing an Android-based application "Act.Fit". This study involved 40 adults as research subjects. Data collection was carried out through an online questionnaire as a physical fitness instrument based on the "Act.Fit" application. The results of the assessment of material experts, media experts, and fitness practitioners on the "Act.Fit" Android-based application are: 1) Material experts give an average score of 4.47 in the "very good" category, 2) Media experts give an average score of 4 .42 in the "very good" category, 3) fitness practitioners gave an average score of 4.81 in the "very good" category. The validity test produces a score of 0.939 which indicates validity. The reliability test produces a score of 0.950, proving that the product is reliable, 5) Small group users give an average score of 3.65 in the "good" category, and 6) The large group gives an average score of 4.47 with a score of "very good" Good". After going through a series of research stages above, the final product of the "Act.Fit" application is ready to be used by the wider community in the following research year.