Answer: FALSE
It depends on your goals! Both have their pros and cons.
Running outside:
- Being outdoors has mental health benefits
- More uneven and challenging terrain
- New scenery can boost your motivation
- May engage more muscles
- More bone-building benefits because of harder surfaces
- Is free (except for the cost of sneakers)
Treadmill running:
- Safer at night or during bad weather
- More control over pace, incline, and intervals
- Even, controlled surface may mean fewer injuries
- Less impact than running outside
- Can be boring
- More expensive than outdoor running