When patients ask me where they should read about exercise online, my first recommendation is always the same: the Centers for Disease Control and Prevention. Specifically, the CDC’s Physical Activity Basics page. It is not the only good source. It is the one I trust to be steady, accurate, and free of any agenda except public health.
What the Page Offers
The CDC organizes its physical activity guidance by who it applies to. The page has separate sections for:
- Adults (18 to 64)
- Older adults (65 and up)
- Children and adolescents
- Pregnant and postpartum women
- People with chronic conditions or disabilities
That structure matters. The right amount and type of activity is not the same for a 70-year-old patient with mild arthritis as for a 35-year-old training for a half marathon. The CDC writes a separate, evidence-based section for each.
Why “Official” Matters
A search for “how much should I exercise” returns hundreds of pages. Some are from medical organizations. Many are from supplement companies, fitness influencers, app developers, and content farms that mix half-truths with marketing.
The CDC is different in three ways:
- No products to sell. The recommendations are not designed to drive you to a class, a subscription, or a piece of equipment.
- Built on synthesis, not opinion. The CDC’s guidance reflects the Physical Activity Guidelines for Americans, a federal document built by an independent panel of experts who review the published evidence.
- Updated over time. When the evidence changes, the page changes. You are not reading a 1998 recommendation that has been quietly repeated for decades.
How to Use the Site
If you are reading the page yourself:
- Pick the section that matches your life stage. Do not read the adult section if you are 72. The older-adult section is meaningfully different.
- Read the “key guidelines” first. Skip the policy and program content unless you are curious.
- Bring questions, or anything that surprises you, to your next appointment.
Related Reading
For more on this topic, two related posts on this site:
- Walking: The Most Underrated Heart Workout
- How Much Exercise Do You Actually Need? A Cardiologist’s Perspective
Bring Your Questions to Me
The CDC page is a strong starting point, not a final word. It cannot factor in your specific cardiovascular condition, your medications, or what your last stress test showed. That part is the work we do together. Bring the page to your next visit if anything you read raises a question. You can also contact our office if you do not have a follow-up scheduled.
