How does exercise help people with alzheimers?

It does: The exact mechanism is not known, but people with alzheimer's who do low-moderate level aerobic exercise (like a stationary bike or treadmill) daily have slower disease progression, less anger/anxiety and fewer complication than those who do not. Remember that the exercise must be supervised, especially for those with severe dementia, so that person does not get hurt or wander off.

Exercise and Alzheim: It won't cure it but definitively will help with the mobility and the cardiopulmonary function and thinking process. Studies have shown that prolonged exercise significantly lowered the brain’s stores of energy, and that the losses were especially noticeable in the frontal cortex and the hippocampus, that are involved in thinking

Positive: Leading a physically active lifestyle can have a significant impact on the wellbeing of people with dementia. Exercise is beneficial for physical and mental health and may improve the quality of life for people in all stages of the condition. https://www.alzheimers.org.uk/site/scripts/documents_info.php?documentID=1764