Good knee exercises/stretches?

[ejdge]

I've been running a lot lately and my knees are getting sore, any ideas for exercises/stretches? I'm using a pair of good running shoes (Mizunos for lighter runners) but I've been running on concrete. Thanks.

[boxbible]

Stop running on concrete... it's the worse thing you can do to your legs...!!!!

[MrSmall]

And what if you can't? Not everywhere has decent sized parks.

[yung-gun1]

Doing ATG Squats, Heavy weight low reps should build bone mass.

[BRICKS]

i run on concrete as well. my gym is in the lower class city so we run the streets. i usually run in my wrestling shoes but also have some reebok basketball shoes. never had any soreness but i really stretch before i run. hard to explain them over the net but i really focus on the legs.

[Dennis]

Take it easy with the running for a while, give your body some good resting time to heal.

[Mikro]

Doing ATG Squats, Heavy weight low reps should build bone mass.

What are ATG squats? Or are you saying squats are the atg exercise for knees...?