The concept of fragility has proven to be a challenging one to define with precision. One of the most significant challenges in this regard is the lack of consensus concerning the precise nature of the phenomenon. Frailty is one of the leading causes of morbidity and premature mortality in older people. An international standard definition has yet to be established. A number of different measurement methods have been developed, including: The Fried frailty phenotype, the Tilburg Frailty Indicator (TFI) and the Frailty Index. The objective of this study is to analyse muscle activity in order to determine whether it is possible to detect frail subjects by means of simple forearm exercises.