This paper reviews the foundations in which the strength has been recognized as an essential element in the requirements of physical exercise for health, especially in the elderly.The implications of sarcopenia are described as proper syndrome during this vital period and the findings about the importance of muscle mass in the homeostatic balance through its endocrine function.It also scans what it is proposed from consensus and statements from scientific associations, about different strength training manifestations in a health context and it reviews the findings in some meta-analysis and variables related to the functional capacity.Finally, it makes an approach in some research perspectives regarding this issue.