Sidney Crosby knows he won't play hockey forever. On the eve of his 22nd season, it's hard to tell

And there the longtime Pittsburgh Penguins captain is on a random early fall Tuesday, doing what he has always done: grinding through an hour-long practice with an intensity that shows no signs of waning as the player who arrived in the NHL as a teenage prodigy closes in on his 40th birthday.

Watch Crosby stand in front of the net and deftly deflect a point shot past rookie goaltender Sergei Murashov , who was still in diapers in his native Russia when Crosby made his NHL debut on Oct. 5, 2005. Watch Crosby fail to connect the dots on a pass on one end of the ice, then backcheck furiously before slapping his stick into the end boards in frustration.

Watch the NHL's seventh all-time leading scorer (soon to be in the top five) glide from the half wall to the front of the net and back again during a power play drill, the instincts that have carried him from franchise savior to Olympic gold medalist to three-time Stanley Cup champion taking over as he searches for an opportunity.