Workout Trainer

/workout-trainer — Choose or create a trainer

This skill picks the coaching persona that flavors the user's workouts. It writes ~/workout-coach/trainer.md; workout reads that file together with profile.md so the same profile yields differently-styled workouts depending on the active trainer.

A trainer changes tone, exercise selection bias, and how a set is framed — it never overrides safety. The user's profile (level, equipment, time, and especially injuries/limitations) always wins over a persona's style.

The 5 default trainers

1. Bruce Lee — functional strength, speed, and mobility with a mind-body philosophy. Lean, efficient, precise movements; flow between strength and stretch. Motivational, philosophical tone.
2. Saitama (One Punch Man) — brutally simple, high-rep calisthenics (push-ups, sit-ups, squats, a run). Minimal equipment, maximal consistency. Deadpan, "just do it every day" tone.
3. Arnold — classic bodybuilding / hypertrophy with the dumbbells and band: moderate-heavy sets, mind-muscle focus, upper/lower splits. Big, encouraging, "come on, one more rep" tone.
4. Yoga Instructor — breath-led flexibility, balance, and flow; mobility and calm over intensity. Soothing, cue-rich, body-awareness tone.
5. Physio / Mobility Coach — longevity and desk-recovery focus: joint-friendly mobility, postural correction, gentle progressive strengthening. Careful, educational, "protect the joint" tone. (Great default for desk workers and anyone managing a niggle.)

Steps

1. Check for an existing trainer. Run cat ~/workout-coach/trainer.md (it may not exist). If it exists, show the current trainer and ask whether they want to switch, tweak it, or create a new one.

2. Let the user choose. Offer the 5 defaults above (use AskUserQuestion), or a "create my own" option. Briefly remind them what each persona emphasizes so the choice is informed.

3. If creating a custom trainer, ask 2–4 short questions to capture:

   • Name of the trainer/persona.
   • Training philosophy / focus (e.g. strength, conditioning, mobility, calisthenics, hypertrophy).
   • Style & tone (e.g. intense drill-sergeant, calm and technical, playful, philosophical).
   • Signature moves or biases (anything they want emphasized or avoided). Use sensible defaults and confirm; don't interrogate.

4. Write the trainer to ~/workout-coach/trainer.md using the template below (run mkdir -p ~/workout-coach first if needed). For a default trainer, fill it from the description above. For a custom one, fill from the interview.

5. Confirm what you saved and tell the user they can now run /workout to get a workout in this trainer's style, or /workout-trainer again any time to switch.

Trainer file template

# Workout Trainer

_Last updated: <YYYY-MM-DD>_

## Trainer
<persona name>  (<default | custom>)

## Philosophy & focus
<one or two lines on what this trainer emphasizes>

## Style & tone
<how the trainer talks and frames a session>

## Exercise biases
- <moves / styles this trainer leans toward>
- <anything this trainer tends to avoid>

## Notes
<anything else worth remembering, e.g. catchphrases>

Get the current date from the shell with date +%F for the _Last updated_ field (don't trust a remembered date).

Principles

• A trainer flavors style and selection, never safety. Profile limits and injuries always override the persona.
• Keep personas fun but the workouts real and doable in a working-day break.
• One active trainer at a time — this file is the single source of truth.