NTNU researchers say 30 minutes of high-intensity exercise a week—about 4.5 minutes a day—can markedly improve cardiovascular fitness and lower disease risk.
The key is intensity, not duration: workouts should leave people noticeably out of breath, roughly around 85% of maximum heart rate, with brisk walking enough for some less-fit adults.
Researchers recommend splitting that time across two to four days because blood pressure and blood sugar benefits from hard exercise last only 24 to 48 hours.
CERG says better cardio fitness cuts the risk of more than 30 lifestyle diseases and premature death by 40% to 50%, citing evidence from a 60,000-person 2006 study and later large studies.
The team is pressing Norway to revise official exercise advice and is promoting a heart-rate-based Activity Quotient system, where 25 weekly AQ points were linked to significantly lower disease risk.
Is 30 minutes of high-intensity exercise a weekly miracle cure, or does this new trend carry hidden long-term risks?
Does intense exercise truly protect your brain, or could good brain health simply make you more active?
Just 30 Minutes a Week: NTNU’s Groundbreaking High-Intensity Exercise Recommendation for Global Health
Overview
In May 2026, researchers at NTNU, led by Professor Ulrik Wisløff, introduced a groundbreaking recommendation that challenges traditional exercise guidelines. They propose that just 30 minutes of high-intensity exercise per week can deliver significant health benefits, shifting the focus from duration to intensity. This new approach is based on extensive research, including large-scale studies by NTNU’s Cardiac Exercise Research Group and consistent findings from other countries. By making effective exercise more accessible and less time-consuming, NTNU’s recommendation aims to overcome major barriers to physical activity and redefine how people approach their health.