Begin by demonstrating a fluent, correct solution, or otherwise reminding people what good looks like.
Everyone in the group works on the same task individually, in parallel, for a fixed time.
Ask people to share their results with the whole group - eg everyone voluntarily reports their score or shares their work in an online document.
Celebrate success and encourage people with praise. The facilitator can pick one person’s work to showcase. Give feedback on what consequences this design/code/idea would have in different situations.
Usually you repeat this activity several times in a session - 2 minute intro, 5-10 minutes everyone creates something, 5-10 minutes showcasing, repeat 3-5 times. Each activity can build on the previous one, so you improve competency at the same skill, or you can cover several unrelated topics.
Benefits and Pitfalls
Most people are actively doing something most of the time, which is more fun than watching.
Frequent feedback and encouragement makes people more likely to want to improve and to remember the skill.
The facilitator can steer the group towards better solutions during the showcasing part.
This is a good way to gain fluency with applying a technique, since there is so much hands-on time for each person.
If the individual work goes on for more than about 10 minutes people may get bored or off-track.
If individuals don’t have any competency or understanding of the technique beforehand, they may get stuck or confused and not produce anything useful during their individual work.