Walking for 30 minutes 4-5 times per week can increase a person's lifespan by 20 percent.
Tripling that — running for 90 minutes, 4-5 times per week — improves that number by only 4 percent.
Tripling that — running for 90 minutes, 4-5 times per week — improves that number by only 4 percent.
Walking may be the best exercise on the planet. (No evidence yet on whether finger walking is also beneficial.)