Casey has Hashimoto's and gained 40 pounds after years of HIIT and strict dieting. The misdiagnosis: her body is more reactive to stress, not needing more exercise. The fix: scale back to MAPS 15, yin yoga only, eat intuitively (track protein, not calories), and treat gluten avoidance with zero-tolerance seriousness — because even a weekend bite can reset a month of immune system progress.