Few athletes have been on top of their game as long as Adam Nelson.

At today's USA Indoor Track & Field Championships in Boston, Nelson goes for his third USA Indoor title in the shot put since 2001.

The two-time Olympic silver medalist is having a great season, setting indoor personal bests, including the No. 3 throw of all time. He is the current world leader.

It started with a big winning throw of 72 feet, 5 inches at the Millrose Games in New York on earlier this month. Then he edged closer to the indoor world and U.S. record with another personal-best throw of 73-6 two weeks later at the Tyson Invitational in Fayetteville, Ark.