The NBA title is the hardest title in Major sports to win.

Running takes more energy than skating. Having to use more energy>skating around slamming people.

Yes we've all seen the large amounts of stitches it takes to heal those cuts caused by running!

Blocking a puck as hard as a rock (frozen) at point blank range with any part of your body you can throw in front of it is definitely not as tough as taking a charge.