Exergame-assisted Simultaneous Motor-cognitive Training for Middle-aged Old Adults in China

Inclusion Criteria: * people between 50 and 60 years of age * living in mainland China * confirmed subjective cognitive decline with the following diagnostic criteria; a confirmed case of subjective cognitive decline that meets the subjective cognitive decline-9 scale and an exclusion of mild cognitive impairment cases using the Montreal Cognitive Assessment scale to rule out mild cognitive impairment; subjective decline in memory rather than other cognitive domains; episodes of subjective cognitive decline within the past 5 years; participants perceived to experience a sustained decline in cognitive performance compared to previous normality, independent of an acute event. * the absence of a medical condition that renders exercise inappropriate. This includes, but is not limited to, heart disease, hypertension, diabetes, respiratory disease (e.g., chronic obstructive pulmonary disease), joint and bone disease, and neurological disease (e.g., parkinson's disease) * have the ability to perform independent activities of daily living (as measured by the independent activities of daily living scale) * have no history of falls * have no language barriers and have adequate communication skills Exclusion Criteria: * active mental disorder, serious mental illness, neurological disorder, or cognitive impairment (standard mild cognitive impairment, prodromal Alzheimer's disease or dementia, or other significant cognitive deficits) * substance use for a long-term mental or neurological illness * severe mobility or sensory impairments that may prevent participation in research activities * unstable or acute medical conditions * individuals who have recently undergone major surgery or have acute orthopedic conditions * individuals who refuse to participate