Sync | Devpost

Dashboard
AI Voice-Assistance Coach
Insights

Inspiration

For female athletes, such as professional competitors and military personnel, workout efficiency is crucial to their performance. Despite this, research has shown that 75% of elite female athletes report their menstrual cycle affects their performance, with over 50% identifying the mid-follicular phase (just after menstruation) as their optimal performance window. However, there is currently no seamless way for women to tailor their fitness plans to their menstrual cycles. Coaches and military supervisors often lack the necessary understanding of female physiology to optimize training regimens, resulting in inefficient workouts and increased injury risk.

This gap in sports science and training inspired us to build Sync—a platform that empowers female athletes by syncing their workouts with their menstrual cycles. By leveraging health data and AI-driven insights, we provide an intuitive, science-backed solution that optimizes training for female physiology.

Customer Insights

Our extensive market research revealed compelling data about the need for menstrual cycle-based training:

While 87% of athletes reported their menstrual cycle impacted their performance and training, only 35% had ever discussed it with their coaches.
76.8% of elite track and field athletes described their menstrual cycle as negatively affecting their performance

Customer Interviews

We interviewed 12 female athletes on campus about Sync, and heard "I mean, I love my coach but he'd never think to tailor my workout plan to my menstrual cycle on his own - but I feel my body perform differently throughout the month so it'd be great if he did. But it takes so much manual work getting that data and tweaking workout plans."

What it does

Sync is a comprehensive fitness platform that revolutionizes workout planning for female athletes through several key components:

Health Data Syncing: Using Terra API, we seamlessly import health data from wearables like Oura and Clue, ensuring real-time synchronization of menstrual cycle data.
AI-Powered Workout Plans: We integrate with Gemini AI to generate customized fitness regimens tailored to different menstrual cycle phases, optimizing training intensity and recovery.
Voice-Assisted AI Coach: Powered by ElevenLabs, our AI coach provides spoken workout guidance, making workouts more engaging and accessible.
Performance Insights: Utilizing Perplexity AI, we analyze historical trends in readiness scores, sleep data, and period levels to assess Sync’s effectiveness and refine future recommendations.
Data Export & Integration: Users can export workout and health data to spreadsheets, enabling researchers and platforms like Paradigm to analyze large-scale fitness trends.

How we built it

From the outset, we knew that integrating multiple APIs and ensuring smooth data flow would be a major challenge, so we carefully designed our approach to maintain both technical feasibility and usability. We started by defining our problem statement: empowering female athletes with personalized, cycle-aware fitness plans. From there, we broke down our implementation strategy into key milestones, ensuring that each component aligned with our overarching goal. One of our biggest decisions was how to handle health data synchronization. Instead of manually integrating with multiple wearable platforms, we chose Terra API as our bridge to pull data from Oura, Clue, and other wearables -- pulling the data into Supabase to then query from. This decision streamlined our development and ensured broader compatibility with existing health tracking systems. Once we had access to accurate menstrual cycle and biometric data, we focused on integrating Gemini AI to generate workout plans based on that information, ensuring our AI-generated insights aligned with scientific training recommendations. We also wanted Sync to be more than just a passive data platform—it needed to engage users actively. This led us to incorporate ElevenLabs’ AI-powered voice assistant, allowing the app to act as a virtual workout coach, guiding users in real-time through their personalized training regimens. To provide meaningful performance insights, we then integrated Perplexity AI, which allowed us to analyze trends in readiness scores, sleep quality, and workout effectiveness over time. Finally, we built robust export functionality, allowing users to share their health data in spreadsheet format, opening possibilities for integration with platforms like Paradigm for further analysis.

On the frontend, we leveraged Next.js, React, and TypeScript to ensure a seamless and interactive experience. We chose Supabase as our backend due to its flexibility and ability to store large amounts of user data efficiently. Finally, we hosted and deployed Sync on Vercel, ensuring continuous integration and rapid iteration.

Challenges we ran into

We started off with ambitious goals given that this is our entire team's very first hackathon, and faced a lot of challenges along the way. One of the toughest hurdles was ensuring smooth data integration across multiple APIs. The Terra API provided a powerful interface for syncing menstrual cycle and fitness data, but handling data logic across different APIs from Terra to Gemini to ElevenLabs, etc, and reading/writing to the database throughout proved challenging.

Another challenge arose with the AI-generated workout plans. Initially, Gemini AI’s recommendations were too generalized and did not fully account for the nuances of different menstrual cycle phases. We had to refine our prompts and implement custom logic to ensure that the AI-generated plans were truly personalized and effective. This took multiple iterations, but in the end, we were able to fine-tune the AI to produce actionable, phase-specific workout recommendations. Another challenge was that ElevenLabs provided an excellent text-to-speech interface, but making it feel like a real personal coach required thoughtful UX design and testing. We experimented with different pacing and voice styles to make the guidance more engaging and intuitive.

Accomplishments that we're proud of

We are incredibly proud of building an end-to-end solution that seamlessly guides users from health data collection to actionable fitness plans. By integrating AI-driven insights, real-time coaching, and performance tracking, we’ve developed a tool that addresses a previously overlooked gap in athletic training for women. Beyond that, we’re proud of our ability to leverage multiple advanced technologies and integrate them into a single, cohesive platform. The synchronization between Terra API, Gemini AI, ElevenLabs, and Perplexity AI creates a unique, data-driven approach that truly prioritizes female athletes’ needs.

What we learned

Throughout this process, we gained valuable insights into health data synchronization, AI-powered recommendations, and real-time voice interaction. We learned how to tune world-class AI models to apply them to real-world use cases and that designing for female athletes involves a level of personalization that is often ignored in mainstream fitness solutions. Additionally, this project reinforced the importance of designing for seamless user experience, particularly in the realm of health and fitness, where engagement is crucial to success.

What's next for Sync

We see enormous potential in expanding Sync beyond elite athletes to support all women looking to optimize their fitness:

Expanding Wearable Integrations: Adding support for Natural Cycles, Apple Watch, and Google Pixel for a more holistic health view.
Nutrition & Recovery Insights: Extending our AI-driven recommendations to include nutrition plans and recovery protocols.
Coach & Military Supervisor Tools: Creating dashboards that allow trainers to tailor workouts for female athletes under their supervision. Our vision is to be at the forefront of female health technology, empowering women to train smarter, perform better, and understand their bodies in ways never before possible. If Sync can improve women’s health and fitness outcomes, we consider that success.