Exercise at least 3-4 times a week
All the healthy habits in the world won't help your overall fitness if you sit on the couch all day. To be a healthy man, get up and get active. But how much exercise is enough? Most major health organizations suggest at least 30 minutes of regular, moderate-intensity physical activity on most days to prevent cardiovascular diseases and to maintain fitness. This, of course, comes with the footnote that more exercise is always better.
footnote n.脚注； 补充说明；
I'm afraid that his name will now become a footnote in history.
A footnote is made at the bottom of the page.
The asterisk refers the reader to a footnote.
at least adv.至少；
Try to eat at least four slices of bread a day.
Whatever its obscurities, the poem was clear on at least one count.
The police say his death was an accident, officially at least.