Background/Aims:Due to the demographic trends in Western industrialized countries and to the shortage of health care professionals, new approaches are needed to ensure lifestyle interventions for frail older adults. The majority of older people wants to live independently and self-sufficiently at home as long as possible, simply to not to lose the quality of life associated with this. This state can change abruptly for example by a fall due to various factors (muscle weakness, sensory-motor deficits or fear of falling). Therefore, the aim of this thesis was to determine the impact of a prevention program, carried out by volunteer lay people, on different aspects of quality of life for frail older adults living at home.Methods: This cumulative dissertation consists of four papers. The study protocol (paper one) was published to describe the structured prevention program for frail older adults living at home, carried out by trained lay volunteers. Then paper two reviews the current research on strength training and the different training intensities in older adults. In the third paper, the relationship between physical activity, hand strength, muscle mass, physical function and quality of life was measured, by using the baseline data. Finally, in the fourth paper, the effects of the program on the fear of falling was measured in 80 frail community-dwelling older adults.Results: According to the literature research it is common knowledge that strength training, results in an improvement in activities of daily living and quality of life. However, large differences between studies with regard to the effect size were noticed. In general, progressive adjusted strength training, especially for frail older people, were highlighted to be the most effective strategy to improve function. Furthermore, a close relationship between handgrip strength, balance and overall quality of life was able to be established (paper 3). The data of paper 4 shows that the fear of falling was reduced by 10% in the intervention group (structured strength training and nutritional prevention). This decrease in the fear of falling was associated with an increase in physical performance and in handgrip strength. Conclusion: A structured strength training in combination with diet optimisation to maintenance motor skills and to slow down the progression of frailty, is useful and necessary for frail older people. The linkage of older lay volunteers and frail older adults in a structured program may offer a new method for the management of frailty with a positive impact on different QoL domains and the fear of falling. Furthermore, the buddy system might not only compensate the loss of functional family and social networks, but it can also be a way of overcoming social isolation and loneliness in those affected.