A new study found that during extreme endurance efforts like running a marathon, the brain may temporarily break down its own insulation to use as an emergency energy source.

Dr. Howard Luks didn’t think much about agility — the ability to move quickly while changing speed and direction — until movements that used to come easily became more chall ...

Does the phrase 'leg day' send shivers down your spine? You're not alone. For many, even the most seasoned gym-goers, this ...