By Dr. Mehmet Oz and Dr. Mike Roizen, MDs, From Newsmax

Extreme movie mavens brag about watching “Fanny and Alexander,” which clocks in at more than five hours long, and “West of the Tracks,” with a runtime of nine-plus hours.

And they are bested by intrepid fans who go to see “La Flor,” an 807-minute epic with 40 minutes of credits.

But even those sit-down sessions pale in comparison to the ones that American adolescents and adults log day after day.

According to a recent study published in JAMA, researchers found that over the course of a decade, daily sitting time has increased among kids ages 12 to 19 and adults ages 20 to 64 — from 7 hours a day to just over 8 for adolescents, and from 5.5 hours daily to almost 6.5 for adults.

The risks are well-documented: Being sedentary is associated with thinning of the medial temporal lobe, a part of the brain important for the formation of new memories — and even a lot of physical activity doesn’t reduce such a harmful effect.

In addition, prolonged sitting puts you in the hot seat for obesity, Type 2 diabetes, heart disease, breast and colon cancer, osteoporosis, and depression.

Your solution: Moving more takes a commitment — and a buddy.

At work, set a reminder to stand up every 30 to 60 minutes, and enlist your officemates to join in.

You can also walk around the workplace, have walking meetings, do 30 jumps in place, or take a couple of flights of stairs.

Add after-dinner walks (at the mall or outdoors) to your family routine, and sign kids up for sports activities — and practice with them.

Look for hidden opportunities to move, like parking away from your destination and saying no to elevators.

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