Whether you want to build muscle, burn fat, or live longer, some of the simplest exercises are the best place to start, the retired Navy SEAL Jocko Willink says. Willink, a black belt in Brazilian ...

Now imagine this routine comes straight from a former Navy SEAL, someone who's trained to survive in the most extreme conditions. Jocko Willink, an elite veteran, Brazilian jiu-jitsu black belt ...