Do you know how to push yourself to your limit, and beyond? ... both mentally and physically? Excellence demands that one learn one's own limits, and safely expand that border. For a better understanding, take a look at the attached photo. This picture is of my youngest son during the Minnesota H.S. Cross Country Skiing Regionals. It's at the top of a hill the kids refer to as "the wall" - his expression says it all! Erik says if you don't look like this at the top of the hill, then you're not working hard enough. (note: Erik's father understands the pain also ...)
Brent Schlenker, over at Corporate Learning Strategy & Development had a similar post and discussion recently ... take a look.