---
title: "Lesson 2.1"
---

# Lesson 2.1

**Biomechanics** studies how the body organizes itself to move and bear loads; knowing about posture, balance, mobility, dynamic range, activation, and tension allows us to build effective, safe restrictions **adapted to each person**.

 Estimated reading time: 50 minutes.


## 2.1.6 Tension

![2.1.6 Tension](https://shibari-dojo.online/images/course/t216en_sq.webp)

Managing tension in body and rope turns the rope into a transmitter of vibrations that allows us to direct stimulation and guide the movements of the person being tied.

 Estimated reading time: 12 minutes.


[Read more...](https://shibari-dojo.online/lesson-1/t216-en.md)

## 2.1.5 Activation

![2.1.5 Activation](https://shibari-dojo.online/images/course/t215en_sq.webp)

Muscle activation prepares the body to sustain restriction; maintaining it during practice heightens the perception and transmission of erotic stimuli while protecting ligaments, tendons, and nerves.

 Estimated reading time: 11 minutes.


[Read more...](https://shibari-dojo.online/lesson-1/t215-en.md)

## 2.1.4 Dynamic range

![2.1.4 Dynamic range](https://shibari-dojo.online/images/course/t214en_sq.webp)

Dynamic range is the range of motion a joint reaches without being forced or damaged; distinguishing active from passive range allows us to progress in restrictions while keeping the load on the muscles and not on the tendons or ligaments.

 Estimated reading time: 5 minutes.


[Read more...](https://shibari-dojo.online/lesson-1/t214-en.md)

## 2.1.3 Mobility

![2.1.3 Mobility](https://shibari-dojo.online/images/course/t213en_sq.webp)

Mobility is the ability to actively control joint movement; distinguishing it from flexibility and elasticity allows us to adapt forms to the capacity of the person being tied and to stabilize their joints safely.

 Estimated reading time: 7 minutes.


[Read more...](https://shibari-dojo.online/lesson-1/t213-en.md)

## 2.1.2 Balance and equilibrium

![2.1.2 Balance and equilibrium](https://shibari-dojo.online/images/course/t212en_sq.webp)

Balance is an active state in which the forces acting on the body are offset through small adjustments; learning to use it together with the principle of proportionality allows the person being tied to match their activation to the tension of the rope and reduce the risk of injury.

 Estimated reading time: 11 minutes.


[Read more...](https://shibari-dojo.online/lesson-1/t212-en.md)

## 2.1.1 Posture

![2.1.1 Posture](https://shibari-dojo.online/images/course/t211en_sq.webp)

Posture covers both the anatomical position of the body and the person’s mental state; working on it through the concept of *shisei* (posture – 姿勢) allows us to maintain balance and stability and to perform movements safely and effectively.

 Estimated reading time: 7 minutes.


[Read more...](https://shibari-dojo.online/lesson-1/t211-en.md)