System overview

Mobile-first with realtime sync, AI personalization, and a deterministic rules engine for safety.

Core data flow

AI recommendation pipeline

1. 1

   Collect

   Workouts, HRV, sleep, nutrition, wearable streams

2. 2

   Featurize

   Rolling windows: 7/30/90d load, ACWR, fatigue

3. 3

   Score

   Per-user readiness 0–100 (LightGBM)

4. 4

   Generate

   GPT-4o produces a candidate plan with rationale

5. 5

   Validate

   Rules engine blocks unsafe volume/intensity

6. 6

   Deliver

   Push + in-app card with explainability

Rules engine

Declarative safety guardrails — every AI plan passes through them.

rule "max-weekly-volume"
  when load_next > 1.4 * avg_4w
  then cap_load_to(1.3 * avg_4w)

rule "readiness-floor"
  when readiness < 35
  then swap_to("Mobility 30m")

rule "novice-progression"
  when level == "Beginner" and weeks < 4
  then deload_every(7)

Realtime sync

Stack at a glance