Nate Ebner steps away from NFL to give Olympic rugby a try
Something aches deep within Nate Ebner's chest.
Jogging onto a field at the Olympic training center, he begins warming up with a teammate, the two of them stretching, whipping a ball back and forth.
"I literally feel like my lungs are sore," he says.
The NFL veteran is accustomed to training camp aches and pains, the agony that accompanies…
