The Navy has a new fitness test for active-duty “combat arms personnel,” including members of Naval Special Warfare and Naval ...

Famed biohacker Bryan Johnson and his Blueprint team devised this measure of harmful plastic particles in your blood.

Maybe your knee twinges every time you sink into a squat. Or the joint feels off when you’re doing step-ups. Maybe you just can’t seem to lunge without experiencing some knee discomfort. Simply put, ...