Runners Aren’t Necessarily Healthier Than Walkers

There was a time when the optimal exercise speed was however fast you had to run to get away from a saber-tooth tiger. Even today, in much of the developing world, people exercise through activities such as farming and fetching water that are necessary for survival.

Source: What’s the Optimal Speed for Exercise?

Not the first time I’ve posted news like this

What if you want the cardio without the high impact? SWIM!  But nothing beats walking/running when it comes to barrier to entry.