If sitting still is difficult, then meditative walking can be used. This type of practice is used less frequently than the usual static ones. But for beginners, it and https://www.julianalucky.com/yoga-for-kids can be interesting.
Go outside (preferably in a park or where there are not a lot of cars).
Take a few deep breaths, making sure that your breathing remains even and deep throughout the practice.
Mentally check that all parts of the body are relaxed (as far as possible when walking). Pay special attention to the muscles of the back, neck, shoulders.
Walk at a comfortable pace, focusing on the items you come across. Let go of all thoughts. Pay attention to what you see in front of you, to the sounds that surround you, the sensations in your body. Stop for a while, close your eyes and concentrate only on the sounds. Then continue with your normal practice.
The duration of this form of meditation should be more than 20 minutes.