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Introduction: Detecting frailty and previous status of frailty in the primary care services involves assessing physical conditions such as muscle power, body composition and the physical activity levels. This study aims to assess and characterize the variations in the lower limb muscle power, the body composition and the physical activity levels comparing three groups: frail, pre-frail and robust elderly individuals. Additionally, it seeks to analyse the performance differences between these groups. Aim: Firstly, the objective is to characterize the variations in lower limb muscle power, the body composition and the physical activity levels comparing three groups' groups. This will be achieved by utilizing one linear encoder, the bioimpedance Inbody 770 and the accelerometer GT9x for physical activity level. Secondly, the aim is to examine the disparities between these three groups as observed in the study. Material and methods: This cross-sectional study involves 51 participants aged over 65, comprising 22 frail, 15 pre-frail and 14 robust subjects. The participants were classified with frail syndrome by the Fried criteria and the lower limb muscle power. Results: Significant differences were found between the three groups of frail, pre-frail and robust elderly persons in all the studied variables. Conclusions: The lower limbs muscle power, the body composition and the physical activity level are able to study and analyse the difference between frail, pre-frail and robust elderly persons, and all these tools are susceptible to implemented in the clinical primary care environments. The lower limb muscle power values for the frail elderly are lower than pre-frail and the physically active elderly. However, the variability of the outcome of the other variables was unstable across the different recordings. [ABSTRACT FROM AUTHOR]