#What Is the Minimum Effective Dose?
The minimum effective dose (MED) is the smallest amount of exercise that produces meaningful health improvements. Significant results don't require long gym sessions - they require the right amount done consistently.
WHO guidelines: 150 minutes of moderate-intensity aerobic activity per week (or 75 minutes of vigorous activity), plus muscle-strengthening on 2+ days per week. That's about 22 minutes per day - less time than most people spend scrolling social media.
#The Science: Small Efforts, Big Returns
A landmark study published in the British Medical Journal found that just 15 minutes of moderate exercise per day reduced mortality risk by 14% and increased life expectancy by 3 years. The biggest health gains come from going from zero activity to some activity - the law of diminishing returns means your first 15 minutes are worth more than your second, third, or fourth.
#Minimum Requirements Broken Down
For cardiovascular health (pick one):
- 30 minutes of brisk walking, 5 days/week
- 15 minutes of running, 5 days/week
- Three 10-minute walks spread throughout the day - this works just as well as one 30-minute walk
For strength and muscle health:
- 2 sessions per week (not daily)
- 20-30 minutes per session
- 8-10 exercises covering major muscle groups
- Just 1 set of 8-12 reps initially - single sets can maintain and build muscle, especially for beginners
#Exercise Snacking
Brief bursts of activity throughout the day are genuinely effective - your body doesn't distinguish between formal exercise and vigorous daily activity:
- Taking stairs for 60 seconds, three times/day, improves cardiovascular fitness
- Three 1-minute bursts of vigorous activity daily reduces all-cause mortality by 40%
- Even 4-second all-out sprints (done 5 times with rest) improve fitness
#Quality Over Quantity: Intensity Matters More Than Duration
When working with minimum doses, intensity is more important than duration. Shorter workouts require higher intensity:
- Tabata protocol: 20 seconds all-out effort, 10 seconds rest, repeated 8 times (4 minutes total, HIGH intensity) - improves both aerobic and anaerobic fitness
- 7-minute bodyweight circuits - provide strength and cardiovascular benefits
The key principle: increase intensity before adding more duration. Make your current time slot more challenging before adding more minutes.
#Making the Minimum Work
- Start where you are - if you're doing nothing, 10 minutes daily is transformative
- Prioritize consistency - daily 15-minute sessions beat sporadic 2-hour workouts
- Increase intensity before duration - make current sessions harder before making them longer
- Stack activities - walking meetings, active commutes, stairs instead of elevators
- Define your non-negotiable minimum - the amount you'll do no matter what
#Your Personal Minimum
MED is personal and depends on your current fitness level, health, available time, and goals. For someone sedentary it might be a 5-minute daily walk. For someone already active, it might be maintaining two strength sessions per week during busy periods.
The MED concept isn't about avoiding effort - it's about being strategic when time and energy are limited. Consistent minimum effort almost always beats sporadic maximum effort.