Spielman hands down...If you read his autobiography he used to put on a sweatsuit in the hottest days of summer, climb in his truck, turn the heater all the way up, drive around chewing tobacco. All this was just to test his physical limits.
In the summer on 1997 I participated in the Ohio State Football Summer Camp. Over the summer many former buckeyes come back to workout. I had the opportunity to watch Joey Galloway, Eddie George, Terry Glenn, Shawn Springs and Chris Spielman run 40 yd dashes together. All were wearing parachute type harnesses, Spielman was also wearing a weighted vest with about 20 pouches with some type of weight in them. All took their marks, on the whistle Spielman roasted everyone to the 10 yard mark at 15yds it was even again and at 20 he was in the back of the pack. I was amazed at the way he just out worked everybody. I also had the opportunity to see Andy Katzenmoyer power clean...the quickness that he moved a massive amount of weight was amazing.
Spielman is also noted for playing through a torn bicep and ripped pectoral muscle. Most importantly, he stepped away to be a husband. In the Ray Rice, Adrian Peterson era of the NFL there needs to be more MEN like Chris.