The following Master thesis deals with requirements of flexibility (FIT) employees have to face in the current area of digitalisation of work and how they are linked to employees' health. The aim of the thesis is to discover the role of the work related resources - Job-Control, Support, Equity and Sense of Coherence - in the context of FIT, the subjective appraisal of FIT as challenge/hindrance and employees' health, based on a study among 619 employees in Upper Austria. All in all, these factors seem to have a high potential regarding enhancing employees' health as well as for the prevention of possible health-impairing effects of FIT. Differential direct and moderating effects can be found: First of all, these work related conditions can directly increase the challenge- and decrease the health impairing hindrance-appraisal of FIT. Furthermore it gets obvious that high job control can buffer the positive correlation between FIT and hindrance-appraisal. Additionally, the four factors can constantly directly ameliorate people's health, partly work as functional equivalents in terms of the positive effects of challenge appraisals for health or function as buffering effects regarding the correlations between hindrance-appraisal and health. Various theoretical as well as practical implications for workplace health promotion and evaluation can be deduced from the results of this study.