Add fitness tracking experiment (2026-06-23 workout log)

experiments/fitness/README.md

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+# Fitness Tracking
+
+Personal fitness / workout tracking experiment.
+
+For now this lives inside `ultimate-utils` under `experiments/fitness/`. It may be
+split out into its own dedicated repo later — keeping it here is just a convenient
+starting point.
+
+## Structure
+
+- `logs/` — one Markdown file per workout day (`YYYY-MM-DD.md`), transcribed from
+  handwritten notes or logged directly.
+- `images/` — original photos / scans of handwritten logs, named `YYYY-MM-DD_*.jpg`.
+
+## Log format
+
+Each workout log records, per exercise:
+
+| Field | Meaning |
+| --- | --- |
+| Exercise | Movement / machine |
+| Sets x Reps | e.g. `3 x 12` |
+| Weight | Load (lb unless noted); `?` marks uncertain values from the photo |
+
+A `?` next to a transcribed value means the handwriting was ambiguous — double-check
+against the source image in `images/`.