## 1 Introduction  
With an increase in health consciousness and awareness in modern people, the use of indoor exercise equipment has been increasing. Consequently, various types of exercise equipment are being developed. Exercise equipment, such as treadmills and indoor bicycles, include very simplistic and repeating movements that induce boredom in users. Therefore, exercise equipment with fitted monitors or cell phone mounting devices are being developed to provide features such as listening to music and watching TV. As shown in Figure 1, indoor bicycles and treadmills equipped with Peloton's monitors enable users to simultaneously watch content while exercising, measure the amount of exercise, and recognize diverse exercise-related information. This ultimately increases the users' convenience. Furthermore, the equipment that combines three-dimensional (3D) virtual reality, wherein the users feel like they are exercising outdoors, is progressively being designed [1]. The increase in the diversification of functionalities and the usage of monitor-fixed exercise equipment has led to the gradual widening of the monitor frame. Among the indoor bicycles currently in the market, Peloton's monitor is the largest (22 inches). As the frame expands, the total weight also increases, which can lead to separation or sagging due to the load of the monitor. Although the monitors are gradually becoming thinner and lighter in weight, the resulting impact of damage and sagging cannot be ignored. Therefore, considering these factors, a structural analysis of the monitor frame must be conducted. Particularly, for indoor bicycles, the pedal and saddle experience the greatest force. Additionally, as the force can be concentrated on the handle for balancing and support, it is generally necessary to check the behavior and effect of the monitor mounted on the handle frame. The majority of the existing studies discuss methodologies to confirm the safety and high rigidity of the bicycle frames. These investigations are mainly based on finite element analysis (FEA) for calculating the forces applied to the saddle or pedal, which generally distribute most of the body weight [2,3]. [PERSON] et al. [4] secured reliability in comparison to theoretical results by conducting FEA to reduce the weight of the bicycle while maintaining its rigidity and strength. Likewise, [PERSON] et al. [5] conducted a study to analyze the bicycle frame and its corresponding structural characteristics through FEA. Furthermore, they analyzed the influence of design variables. In existing literature, studies on bicycle frames are dominant; moreover, optimization methods for bicycle handles are being studied [6]. Although several studies have been conducted related to the handle or frame of a bicycle that are highly affected by outdoor factors, there are significantly fewer studies related to indoor bicycles. Indoor bicycles are not affected by outdoor factors such as weather or road conditions. They must be designed in consideration of the weight of the monitor applied to the handle. Therefore, in this study, we aimed to determine the optimal design of an indoor bicycle handle frame by applying FEA, with the additional consideration of the load applied due to the monitor. To minimize effective stress and sagging, the influence was determined through sensitivity analysis among design variables, and an optimal predictive model was derived using the support vector machine (SVM) method. The indoor bicycle handle was designated as an area of interest, and structural analysis was conducted considering the power that could be applied for simplified modeling. Further, the effective stress and sagging according to the design variables were checked by designating the load with the greatest influence. Thereafter, the correlation between the Pareto chart and the sensitivity analysis for each design variable was checked; the dataset was classified; and kernel parameter values were obtained to derive the optimal predictive model by learning with support vector regression (SVR).