GUTS BARBELL: AN AI-DRIVEN MOBILE FITNESS APPLICATION FOR HYPERTROPHY TRAINING, CULTURALLY ADAPTIVE MEAL PLANNING, AND PERSONALIZED CONTENT GENERATION

This paper has outlined the design, theoretical underpinnings and anticipated benefits of GUTS BARBELL, a mobile fitness app based on three distinct modules: a culturally sensitive meal planner, an evidence-based muscle-building program generator and culturally sensitive AI-based blogging content generator. The justification for this project is simple - the market is large and growing, and failing many of its customers by attempting to personalize as an aftermarket service. The distinction of GUTS BARBELL is not in any particular technology decision, but in the integration of three areas of personalization - nutrition, exercise and educational content - into a unified system, and all centred on the person. The meal planning engine's integration of locally relevant food databases with evidence-based macro-nutritional targets is a practical innovation that has implications for adherence. The program generator's use of volume landmarks and dynamic auto-regulation brings the expertise of a coach to a mobile device. The smart blogging system using LLMs offers a way to scale fitness education, at a scale impossible for human content teams. The future work planned includes: First, a full prototype will be developed and tested with a range of users to confirm the design ideas proposed in this paper. Second, the culturally indexed food database will be extended to include foods from the Southeast Asian, Middle Eastern, African and Latin American cultures for wider use. Third, data from wearable devices, especially heart rate variability and sleep data, will be used in the auto-regulation module, enabling recovery management to react to more objective data than just self-reported measurements. Fourth, longitudinal studies will be conducted to examine the effectiveness of hypertrophy, dietary adherence and fitness literacy improvement over 12 and 24 weeks. Finally, we will investigate the blog generation system as a federated learning system where personalization models are improved by collective patterns in user engagement but individual data is not shared. GUTS BARBELL is really not a fitness app, but an attempt to incorporate evidence-based fitness knowledge into a market that has excluded historically marginalised groups. This is the work this paper starts.

Areta, J. L., Burke, L. M., Ross, M. L., Camera, D. M., West, D. W. D., Broad, E. M., Jeacocke, N. A., Moore, D. R., Stellingwerff, T., Phillips, S. M., Hawley, J. A., & Coffey, V. G. (2013). Timing and distribution of protein ingestion during prolonged recovery from resistance exercise alters myofibrillar protein synthesis. Journal of Physiology, 591(9), 2319–2331. Bhattacharya, K., Ghosh, A., & Saha, I. (2020). Cultural adaptation in dietary counseling improves adherence: A systematic review. Journal of Nutritional Science and Vitaminology, 66(2), 112–121. Brown, T. B., Mann, B., Ryder, N., Subbiah, M., Kaplan, J., Dhariwal, P., Neelakantan, A., Shyam, P., Sastry, G., Askell, A., Agarwal, S., Herbert-Voss, A., Krueger, G., Henighan, T., Child, R., Ramesh, A., Ziegler, D. M., Wu, J., Winter, C., … Amodei, D. (2020). Language models are few-shot learners. Advances in Neural Information Processing Systems, 33, 1877–1901. Chen, J., Yi, B., Wang, L., & Liu, T. (2022). Reinforcement learning-based adaptive exercise prescription: A feasibility study. IEEE Transactions on Neural Systems and Rehabilitation Engineering, 30, 1245–1256. Fleck, S. J. (1999). Periodized strength training: A critical review. Journal of Strength and Conditioning Research, 13(1), 82–89. Grand View Research. (2023). Fitness app market size, share & trends analysis report. Grand View Research. ICMR-NIN. (2017). Nutritive value of Indian foods. Indian Council of Medical Research — National Institute of Nutrition. Israetel, M., Hoffman, J., & Smith, C. (2019). The muscle and strength pyramids: Training and nutrition (2nd ed.). Renaissance Periodization. Khadilkar, A. V., Mandlik, R. M., & Chiplonkar, S. A. (2019). Protein intake adequacy in Indian athletic populations. Indian Journal of Medical Research, 150(3), 243–251. Krieger, J. W. (2010). Single vs. multiple sets of resistance exercise for muscle hypertrophy: A meta-analysis. Journal of Strength and Conditioning Research, 24(4), 1150–1159.