Sit on an invisible chair
You will briefly hold a seated shape supported by a wall. Holding still still uses muscles, so comfort matters more than reaching the film’s time.
- Move
- Explorer
- About 10 minutes
Grown-up needed: yes for checking the space and supervising movement
This page adds a grown-up, a stable plain wall and a clear nonslip floor to what the film lists, so follow the page.
What you need
- A stable plain wall
- A clear nonslip floor
- A timer
- A grown-up
The rule
Back flat. Knees at a right angle.
How to do it
- Ask a grown-up to check the wall and floor.
- Stand with your back against the wall and feet comfortably forward.
- Slide a small comfortable distance down with the grown-up nearby.
- Attempt the stated shape only if it is comfortable.
- Return upright immediately if there is strain or discomfort.
- Discuss the effort without adding another timed target.
Why it works
Your muscles can produce force while holding a position rather than making an obvious movement. In a wall sit, several muscles help support your weight and keep the joints positioned, while the wall provides contact behind you. How demanding the position feels depends on body position and the person. Stillness therefore does not mean that no work is being done by the body. This observation cannot rank muscle strength or replace individual advice about suitable exercise.
Make it harder
- Describe where support comes from without holding longer.
- Compare the model with ordinary sitting on a chair.
- Explain why a still position can require continuous muscle force.
Ask Taz
- Why do muscles work when I am still?
- Why does changing position change the effort?
- Why is a wall sit different from sitting on a chair?
For grown-ups
A grown-up supervises throughout, and the child stops at any discomfort. A right-angle knee position is the source rule, not a position to force. If it is unsuitable, discuss the film instead of doing it. Ask at dinner: “What was supporting your weight, and what did your muscles contribute while you stayed still?”
Taz is an AI and can be wrong, so stay close by. Read how safety works on Taz.
Show us yours
Film your hands and what you made, not your face or name. Ask a grown-up before posting anywhere else.
Questions parents ask
Does the child need to reach the film’s target?
No. The film shows an example, not a required performance. Begin with a short comfortable attempt and stop whenever needed. The useful result is a description of what happened, and the stated time estimates preparation and discussion as well as the activity.
Can we adapt the movement?
Yes. Choose a comfortable version with a grown-up, or discuss the film instead of doing the action. Say clearly when the adaptation changes the stated challenge rule. Avoid making the activity faster, longer or less stable simply to make it harder.
Do we need to share a video?
No. Talking about the attempt at home is enough. Follow the privacy line above for any optional sharing.
More to try
See all Taz Challenges, or look through the science labs. One place for every why. Ask for early access at aitaz.com
Try it in 3D: Muscles.