Mark Hyman, MD, delivered a blunt warning on CBS Mornings this month: “The biggest risk for your health is the couch.” But the longevity doctor’s solution isn’t spending hours in a gym. It’s making strength and intensity part of everyday life—even in tiny doses.

CBS framed Hyman’s Sept. 17 appearance around the two types of exercise he prioritizes for longevity: strength training and high-intensity interval training, or HIIT. Hyman then offered a lower-barrier way to start: short “exercise snacks” scattered through the day.

The Workout Doesn’t Have to Look Like a Workout

Hyman’s examples are deliberately simple: stand up from a chair 10 times, do wall push-ups, march quickly in place for 30 to 60 seconds, or walk at a pace where conversation is possible but singing is difficult.

“You don’t need a gym or an hour-long workout to benefit,” Hyman wrote after the CBS appearance. His broader message: “Your starting point doesn’t matter. What matters is going from nothing to something.”

That idea lines up with federal activity guidance. The CDC says adults should “move more and sit less,” noting that some physical activity is better than none. Adults should still aim for at least 150 minutes of moderate-intensity aerobic activity—or 75 minutes vigorous—each week, plus muscle-strengthening work on at least two days.

‘Exercise Snacks’ Are Promising, but Not Magic

The science behind these mini-bouts is encouraging, though not definitive. A 2024 scoping review of 32 studies found exercise snacks “feasible and safe” and reported modest improvements in cardiorespiratory fitness in limited trial evidence.

The researchers also cautioned that the evidence base remains small and that effects on physical function, mood and quality of life were unclear. In other words, a minute of marching shouldn’t be sold as a replacement for a complete training program.

That distinction makes Hyman’s advice more useful, not less. The snack is the entry point; progressive exercise remains the goal.