Recent advancements in Virtual Reality (VR) technologies have significantly enhanced immersive experiences, bridging the gap between physical and digital worlds. Modern Head-Mounted Displays (HMDs) and motion capture systems such as the KAT VR treadmill have transformed VR into a dynamic platform for applications ranging from entertainment to fitness. These innovations offer opportunities to integrate physical activity within virtual environments, promoting engaging and interactive experiences. This paper presents an overview of a work-in-progress quality of experience (QoE) evaluation of a VR fitness system that explores the utility of a VR locomotion system. Explicit measures will be captured using traditional post-experience questionnaires, whilst implicit measures of QoE in the form of heart rate, electrodermal activity, and skin temperature will be captured using the Emotibit wristband. In parallel, the system will monitor objective metrics which aim to understand the number of calories burned, and distance travelled. The findings aim to highlight the potential of VR as a tool for promoting physical health while contributing to the growing field of fitness-focused social VR.