# Interface: ActivityDemand

[**lifecycle-kit**](https://jonbogaty.com/lifecycle-kit/api/readme/index.md)

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[lifecycle-kit](https://jonbogaty.com/lifecycle-kit/api/readme/index.md) / [chem](https://jonbogaty.com/lifecycle-kit/api/chem/readme/index.md) / ActivityDemand


# Interface: ActivityDemand {#interface-activitydemand}


Defined in: [chem/metabolism.ts:45](https://github.com/jbcom/lifecycle-kit/blob/074e4e7b8038d3e2de9eb44c4b5b5aee0ef02b48/src/chem/metabolism.ts#L45)


## Properties {#properties}



### exertion {#exertion}


> **exertion**: `number`

Defined in: [chem/metabolism.ts:47](https://github.com/jbcom/lifecycle-kit/blob/074e4e7b8038d3e2de9eb44c4b5b5aee0ef02b48/src/chem/metabolism.ts#L47)

Exercise: play and walks. Drives protein into muscle.

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### growth {#growth}


> **growth**: `number`

Defined in: [chem/metabolism.ts:49](https://github.com/jbcom/lifecycle-kit/blob/074e4e7b8038d3e2de9eb44c4b5b5aee0ef02b48/src/chem/metabolism.ts#L49)

Growth pressure: young pets build structure.

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### rest {#rest}


> **rest**: `number`

Defined in: [chem/metabolism.ts:51](https://github.com/jbcom/lifecycle-kit/blob/074e4e7b8038d3e2de9eb44c4b5b5aee0ef02b48/src/chem/metabolism.ts#L51)

Rest: sleep converts reserve into insulation.