Full-stack Python web app that generates personalized training programs
from peer-reviewed exercise science research.

Features:
- 97-exercise database with muscle region targeting
- 21 split options across 3-6 day schedules (UL, PPL, Arnold,
  Posterior/Anterior, Torso/Limbs, and more)
- No consecutive muscle overlap enforced across all non-full-body splits
- Per-movement-pattern training level classification
- Fractional set volume accounting with MEV/MAV/MRV landmarks
- 4-week mesocycle with RIR-based progression (3-4 → 2-3 → 2 → 1-2)
- Reactive deload protocol (not forced schedule)
- Antagonist superset pairing displayed as "Exercise 1 // Exercise 2"
- Exercise regeneration via same-region substitution groups
- Mobile-first dark theme UI with per-week clipboard copy for Sheets
- CSRF protection, rate limiting, security headers, input validation
- Deployable to Vercel via serverless Python function