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In anatomy, there is such a thing as the homunculus of the post-and precentral gyrus. The precentral gyrus is responsible for movement, and the postcentral gyrus is responsible for sensation. What we need is a motor homunculus – http://www.medicinform.net/human/vnd2.jpg
Let me explain what the point is. The larger the body fragment in the image , the greater the neural representation in this area of the cortex. As you can see, the brush is given almost the largest representation (spoiler alert, because the brush is a very, very complex device consisting of several dozen muscles). The fact is that the cortex is mainly responsible for voluntary movements, that is, writing, modeling, and various fine motor skills.
But you still don't understand how it improves brain function, do you?) The fact is that our brain can be trained. The more we repeat a certain movement and the more complex it is, the more neurons our brain uses, the more connections are created, and the better our memory and response are. And yet, it should be added, if we are talking about the speech function, and specifically about understanding and reproduction, then next to the representation of the hand, just to the right, in another gyrus, is the so-called Wernicke zone. It is responsible for the functions described above (spoiler alert, it is not the only one). And so, while developing fine motor skills, you simultaneously train this zone, since the brain is not a system of isolated centers. This technique is used to restore speech to people who have had a stroke. That is, they train speech at a speech therapist, but in parallel with this, they also spin small details at their leisure.
But if we talk about the legs, then this is a less effective tool, since the representation is very, very small. However, in the absence of an alternative, you can also use the legs, or rather the foot.
Well, that's something like that)) I hope I answered the question and will be happy to accept the amendments)