> For the complete documentation index, see [llms.txt](https://docs.moviestorm.co.uk/firststage/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.moviestorm.co.uk/firststage/basics/working-with-time/activities.md).

# Activities

Activities are a key concept behind FirstStage: they describe the time-like behaviour of things. 

Activities act upon a *subject* thing and occasionally other things (e.g., the activity for a character holding a prop has the character as *subject* and the prop as *object*).

An activity has a Start Time and a Duration that determine when the activity plays. It is typically represented as a block on the timeline. 

You can drag an activity along the timeline to change when it happens.

For some activities, you can also stretch the duration or trim/reveal clips: point at the activity to reveal triangular handles at the end and then drag the handle.

<figure><img src="/files/WnLu5ljT77qkjDZc27bE" alt=""><figcaption></figcaption></figure>

If you point at an activity on the Timeline and press the **Inspect** button, a menu will pop up with options depending on the type of activity.&#x20;

<figure><img src="/files/CeKyksoptnMODx5vmhrv" alt=""><figcaption></figcaption></figure>

<table data-header-hidden><thead><tr><th width="161"></th><th></th></tr></thead><tbody><tr><td><strong>Delete</strong></td><td>Delete the activity from the timeline.</td></tr><tr><td><strong>Duplicate</strong></td><td>Duplicate the activity and place the copy immediately afterwards. This is useful for building a sequence of repeated actions.</td></tr><tr><td><strong>Split</strong></td><td><p>Split the activity into two parts before and after the current time. </p><p><em>This is only available for clip activities which span the current time.</em></p></td></tr><tr><td><strong>Edit</strong></td><td>Shows a screen where you can change the behaviour of the activity.<br>Return here by pressing the top-left arrow or the thumbpad back arrow.<br><em>This is only available for some activities like</em> <a href="/pages/paSwdAVqbC4NlERHhGf2"><em>Rigid Animations</em></a><em>.</em></td></tr></tbody></table>

### Keyframes

Some activities contain a series of keyframes that are interpolated between. Such an activity is shown with a transparent background and a solid pip for each keyframe.

You can drag the keyframe pip along the timeline to change its timing. To change the value of a keyframe you should scrub to the keyframe and then change the original property in the same way you first created it.

You can also delete a keyframe by summoning the menu with the **Inspect** button.