For many, running burns stored glycogen instead of body fat, which triggers cravings for carbohydrates to replenish those stores and can lead to losing muscle instead of fat.

To make walking more beneficial, seek out varied and challenging surfaces like cobblestones or uneven trails, which Mark Sisson calls 'foot candy' for strengthening your feet.

Intense, prolonged running diverts so much blood flow away from the digestive system that it can cause the gut to become ischemic (starved of oxygen), leading to severe issues.

Thick, cushioned running shoes were originally created not for the public, but to help elite, skinny runners with perfect form log more miles without getting injured.

The modern marathon distance of 26.2 miles was not set by ancient Greeks, but in 1908 so the Olympic race could conveniently start at Windsor Palace for the Queen of England.

The nutrient C15:0, available in a product called Fatty15, is a newly discovered 'geroprotector' that strengthens cell membranes and may outperform drugs like rapamycin on some health markers.

Most runners train in a 'black hole' where their heart rate is too high to burn fat but too low to improve VO2 max, meaning they are just 'practicing hurting' without getting better.

A company called Level Up Health offers oral, needle-free versions of popular healing peptides like BPC-157 and TB-500.