每天走一万步有助于避免老年痴呆。。。(about 5 miles)
https://www.yahoo.com/lifestyle/walking-9-800-steps-per-140749315.html
Individuals who lace up their sneakers and walk for 9,800 steps per day are half as likely to develop dementia as their inactive peers. Even walking just 3,800 steps each day (about 2 miles) can decrease dementia risk by 25%.
这个没写清楚,这里面重要的是长度呢,还是时间。。如果跑同样距离,时间短了,是否收到同样效果。