aikido

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SKILL.md (first lines)

# Practice Aikido

Develop an aikido practice rooted in centering, blending with incoming force, and resolving conflict through controlled technique rather than opposing strength with strength.

## When to Use

- Learning a defensive martial art that prioritizes de-escalation and controlled resolution
- Developing the ability to redirect aggression without causing unnecessary harm
- Building safe falling skills (ukemi) applicable to any physical activity or emergency
- Cultivating calm centeredness under physical pressure or confrontation
- Complementing tai chi or meditation with a partner-based martial practice (see `tai-chi`, `meditate`)
- Training awareness and response to multiple simultaneous threats

## Inputs

- **Required**: Practice space with a padded or yielding surface (tatami, judo mats, grass; avoid concrete)
- **Required**: Comfortable clothing allowing full range of motion (gi preferred; loose exercise clothing acceptable)
- **Optional**: Training partner (essential for techniques; solo practice covers centering, ukemi, and movement)
- **Optional**: Practice weapons (wooden: jo staff ~128cm, bokken sword ~102cm, tanto knife ~30cm)
- **Optional**: Experience level (beginner, intermediate, advanced; default: beginner)
- **Optional**: Available practice time (minimum 20 minutes; recommended 60-90 minutes)

## Procedure

### Step 1: Ground and Center

Every aikido technique begins from a centered state. Without center, technique becomes muscular struggle.

1. Stand in hanmi (half-facing stance): one foot forward, feet roughly shoulder-width apart at 60-degree angle
2. Bend knees slightly — weight sinks toward the one-point (seika tanden), located 5cm below the navel
3. Relax the shoulders completely — let them drop away from the ears
4. Extend awareness outward while keeping attention anchored at the one-point
5. Test your center: have a partner push gently on your chest
   - If you resist with upper body, you are not centered — relax and sink lower
   - If you maintain stability without effort, center is established
6. Practice weight underside: imagine that the heavy part of each arm is the underside; let the upper surface feel light and buoyant
7. Extend ki: project calm, positive energy forward through the fingertips — not tension, but focused intention

**Got:** A stable, relaxed stance where pushes are absorbed through the structure into the ground rather than resisted by muscles. A quiet mind with broad awareness.

**If fail:** If the stance feels rigid, you are holding tension. Shake out the arms and legs, take 5 deep breaths, and re-establish from scratch. If pushes easily displace you, lower your center of gravity (bend knees more) and focus on the one-point. Centering is a skill that deepens over months — initial wobbliness is normal.

### Step 2: Master Ukemi (Falling and Rolling)

Ukemi is the art of receiving technique safely. It is the most important skill in aikido — you will fall thousands of times.

```text
Ukemi Progression:
┌────────────────────┬──────────────────────────┬───────────────────────────┐
│ Level              │ Technique                │ Practice Method            │
├────────────────────┼──────────────────────────┼───────────────────────────┤
│ 1. Backward fall   │ Sit down, roll back,     │ From seated, then squat,  │
│ (ushiro ukemi)     │ slap mat with both arms  │ then standing. Chin to    │
│                    │ at 45 degrees            │ chest — never hit head    │
├────────────────────┼──────────────────────────┼───────────────────────────┤
│ 2. Side fall       │ Fall to the side, arm    │ From kneeling, then       │
│ (yoko ukemi)       │ slaps mat, body in arc   │ standing. Land on the     │
│                    │ — not flat on the back   │ fleshy side, not hip bone │
├────────────────────┼──────────────────────────┼───────────────────────────┤
│ 3. Forward roll    │ Roll diagonally over     │ From kneeling, then       │
│ (mae ukemi)        │ shoulder: hand-forearm-  │ standing, then moving.    │
│                    │ shoulder-opposite hip    │ The line is diagonal,     │
│                    │                          │ never straight over spine │
├────────────────────┼──────────────────────────┼───────────────────────────┤
│ 4. Breakfall       │ High fall received with  │ Only after forward roll   │
│ (tobi ukemi)       │ a slap and roll at speed │ is completely smooth.     │
│                    │                          │ Build height gradually    │
└────────────────────┴──────────────────────────┴───────────────────────────┘
```

Key principles:
1. The slap absorbs impact by spreading force across the arm surface — time it to land before the body
2. Tuck the chin on every fall — the head never contacts the ground
3. Exhale on impact; holding the breath creates rigidity and increases injury risk
4. Forward rolls should be round and smooth — if there are thuds or flat spots, the body is not curved enough
5. Practice both sides: right shoulder forward and left shoulder forward

**Got:** After 2-3 months of regular practice, forward rolls are smooth and quiet on both sides. Backward falls are automatic (no fear response). You can be thrown at moderate speed without hesitation.

**If fail:** If forward rolls cause shoulder pain, the angle is likely too steep (going over the top of the shoulder instead of across the back diagonally). Have a partner or instructor check the line. If fear prevents commitment to the roll, return to the kneeling version and build up gradually. Never force a breakfall before the forward roll is second nature.

### Step 3: Practice Basic Techniques

The four foundational techniques address the most common attack scenarios and embody aikido's core principles.

```text
Technique Selection by Attack:
┌─────────────────┬──────────────────┬──────────────────────────────────────┐
│ Attack          │ Technique        │ Principle                            │
├─────────────────┼──────────────────┼──────────────────────────────────────┤
│ Straight strike │ Irimi-nage       │ Enter behind the attack line, lead   │
│ (shomen-uchi)   │ (entering throw) │ attacker's head in a spiral, project │
├─────────────────┼──────────────────┼──────────────────────────────────────┤
│ Diagonal strike │ Shiho-nage       │ Redirect the attacking arm overhead  │
│ (yokomen-uchi)  │ (four-direction  │ in a spiral, control the wrist, cut  │
│                 │ throw)           │ down to throw in any direction       │
├─────────────────┼──────────────────┼──────────────────────────────────────┤
│ Wrist grab      │ Kote-gaeshi      │ Blend with the grab energy, apply    │
│ (katate-dori)   │ (wrist turn)     │ outward wrist rotation to unbalance  │
│                 │                  │ and project the attacker             │
├─────────────────┼──────────────────┼──────────────────────────────────────┤
│ Lapel/shoulder  │ Ikkyo            │ Control the elbow and wrist, pin     │
│ grab (ai-hanmi) │ (first teaching) │ the arm to the ground. Foundation    │
│                 │                  │ for all immobilizations              │
└─────────────────┴──────────────────┴──────────────────────────────────────┘
```

For each technique:
1. Begin with the attack at slow, cooperative speed
2. Blend first: move your body off the attack line (never block head-on)
3. Connect: make contact with the attacker's arm or body to feel their balance
4. Redirect: use circular motion to guide the attacker's energy into the technique
5. Complete: throw or pin with control — the goal is to end the encounter, not to injure
6. Practice 10-20 repetitions per side, alternating roles (nage/tori throws, uke attacks and falls)
7. Gradually increase speed and resistance as both partners gain proficiency

**Got:** Techniques feel smooth and circular. The attacker is led rather than forced. At cooperative speed, both partners finish the exchange safely and without strain.

**If fail:** If a technique requires significant muscular effort, the blending is incomplete — the defender is fighting the attack instead of redirecting it. Return to the moment of contact and practice the initial blend in isolation. If the attacker feels yanked or wrenched, slow down and focus on leading with the center, not pulling with the hands.

From pjt222/agent-almanac, MIT.

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