31This research aimed to associate for the first time in the literature the Regulatory Focus and 32 Self-Determination theories to understand the dynamics of physical activity practice in the 33 health context. Two cross-sectional studies were conducted with 603 (Study 1) and 395 (Study 34 2) French volunteer participants aged from 18 to 69 and 19 to 71 respectively, and healthy or 35 concerned by a health condition. The main results of structural equation modeling analyses 36 demonstrated that across the two studies, health promotion focus was positively associated with 37 intrinsic motivation (.44 < β < .74, p < .001), integrated regulation (.47 < β < .72, p < .001), 38 identified regulation (.40 < β < .69, p < .001) and introjected regulation (.41 < β < .53, p < .001), 39 whereas health prevention focus was positively related with external regulation (.31 < β < .45, 40 p < .001) and amotivation (.32 < β < .38, p < .001). Bootstrapping analyses main results in 41 Study 2 showed that health promotion focus was indirectly associated with physical activity 42 through intrinsic motivation (95% CI [.02 to .11]), integrated regulation (95% CI [.00 to .08]), 43 identified regulation (95% CI [.00 to .09]) and introjected regulation (95% CI [.04 to .12]), 44 whereas health prevention focus was indirectly associated with physical activity through 45 external regulation (95% CI [.00 to .12]). These studies reveal meaningful associations between 46 Regulatory Focus and Self-Determination theories' variables which support the relevance of 47 associating these two models to understand the processes underlying the physical activity 48 practice. 49 50 51 3 52 53 In recent years, the consequences of a lack of Physical Activity (PA), both for 54 individuals' health and in terms of costs for health systems [1] have led governments and health 55 professionals to wonder about their capacity to modify people's lifestyles through various PA 56 promotion strategies. The Global Action Plan adopted by the World Health Organization aims 57 for example to reduce the lack of PA by 10% by 2025 [2]. This new awareness is also 58 manifested in the development of new technologies favoring PA and in particular by the 59 development on the market of coaching apps which greatly facilitate access to the practice.60 However, while health professionals and public health communication campaigns recommend 61 being physically active on a regular basis, almost half of all Europeans do not practice PA and 62 this proportion has grown steadily in recent years [3]. A better understanding of motivational 63 issues surrounding engagement in PA thus becomes of utmost importance.
64Based on the Regulatory Focus Theory (RFT, [4]), previous studies showed that 65 promotion and prevention regulatory foci are two significant motivational determinants of the 66 adoption of various health behaviors [5]. Promotion focus involves a strategic inclination to be 67 enthusiastic by approaching matches with the desired end-states, while prevention focu...