Final Conclusion: Descartes's mind and body are really distinct.

Aristotle did not believe in Platonic Forms, existing independently oftheir instances. Aristotelian forms (the capital ‘F’ hasdisappeared with their standing as autonomous entities) are thenatures and properties of things and exist embodied in thosethings. This enabled Aristotle to explain the union of body and soulby saying that the soul is the form of the body. This means that aparticular person's soul is no more than his nature as a humanbeing. Because this seems to make the soul into a property of thebody, it led many interpreters, both ancient and modern, to interprethis theory as materialistic. The interpretation of Aristotle'sphilosophy of mind—and, indeed, of his whole doctrine ofform—remains as live an issue today as it was immediately afterhis death (Robinson 1983 and 1991; Nussbaum 1984; Rorty and Nussbaum,eds, 1992). Nevertheless, the text makes it clear that Aristotlebelieved that the intellect, though part of the soul, differs fromother faculties in not having a bodily organ. His argument for thisconstitutes a more tightly argued case than Plato's for theimmateriality of thought and, hence, for a kind of dualism. He arguedthat the intellect must be immaterial because if it were material itcould not receive all forms. Just as the eye, because of itsparticular physical nature, is sensitive to light but not to sound,and the ear to sound and not to light, so, if the intellect were in aphysical organ it could be sensitive only to a restricted range ofphysical things; but this is not the case, for we can think about anykind of material object (De Anima III,4; 429a10–b9). Asit does not have a material organ, its activity must be essentiallyimmaterial.

Conclusion: Descartes's mind is really distinct from his body.

When such awareness did occur, however, the result was conscious sensation -- body affecting mind.

René Descartes: The Mind-Body Distinction

Descartes's Second Argument for the Real Distinction of Mind andBody
First Conceptual Premiss: Descartes cannot in thought divide his mindinto parts, i.e., he cannot conceive of his mind as divisible.

Descartes’s changing mind - ScienceDirect

First Conclusion: God can bring it about that Descartes is himself amind without a body, and also bring it about that his body exists apartfrom him as a mind.

What causal principle does Descartes employ to establish the realdistinction of mind and body?
Meditation is a practice that someone may train their mind to be in a state of consciousness that benefits their mind and body.

Descartes and the Mind-Body Problem (Oxford, 2002)

It is well known and proven that over time the benefits of meditating on a regular basis promotes the development of inner calmness, connectedness, focus, flow, a clear clarity of mind, a focused and more stable grounded concentration, along with coherency of thought, increased creativity, being more open and receptive to receive insights, solutions to problems and new ideas, a balanced and harmonious centred inner equilibrium, a relaxed happy body, mind and spirit, which in turn assists...

5. What is Descartes's argument for his claim that his nature(as a composite of mind and body) is optimally designed?

Descartes's mind and body are really distinct.

Descartes concedes that if God had given hima nature that makes systematic or intrinsic mistakes, God would indeedbe a malicious deceiver -- but only if God could have done better. It's true that from time to time his nature (as the composite of mind andbody) does mislead him systematically or intrinsically, e.g., when thirstprompts him to drink when he is suffering
from dropsy, because what his nature then impels him to do is to consumeliquid, which is in fact bad for his body in the circumstances. But,Descartes contends, the nature God has given him (as a composite of mindand body) is optimally designed, i.e., it is the best designpossible for a creature composed of mind and body. But no one shouldbe blamed for doing
what is best, so God is not blameworthy for having given Descartesa nature that occasionally makes intrinsic mistakes. God, therefore,is not a malicious deceiver.

Different aspects of the mind-body problem arise for different aspectsof the mental, such as consciousness, intentionality, the self.

Descartes's Theory of Mind - Oxford Scholarship

Conceptual Premiss: Descartes has a clear and distinct conception ofhimself as a mind (thinking substance) without a body, and of his bodyapart from himself as mind.