Weights and Core Training Ideas

How bad are the knees?  Can you still walk (without crutches or a brace)?  What about using an elliptical machine?  Have you considered water-jogging?

In the meantime, you can work your core muscles, as these help stabilize you.  Work both your abs AND lower back.  Depending on how bad your knees are, I'd see about building up quad strength (leg extensions, leg presses, hamstring curls) to help the knees.  Stay away from squats and lunges until the knees are better, or you might hurt them more.

Good luck.

Ah, a little more info is always helpful.  Where'd you get the shoes you run in?  Get a professional fitting at a running-shoe store.  They'll check you on a treadmill, and get the right shoe for you.  They may recommend orthotics, if necessary, but you may just need new shoes.

I saw that in your other thread.  Once you get the bike fitted, you'll probably eliminate that pain.  However, don't think that one shoe fitting lasts forever, even if it's the same model shoe.  Any change in running habits (correcting stride length, turnover, running taller, leaning forward, etc.) will change your foot strike.  I would have my fit checked at least once a year...

Water running is done in a pool, generally in water deep enough so you do not touch. Here are a couple of rudimentary articles:

http://www.ehow.com/how_10340_practice-deep-water.html

http://www.goswim.tv/text/tri/waterrun.html

Here’s some of the equipment you can use:

http://www.roadrunnersports.com/cgi-bin/rrs/rrs/ProductPg.jsp?baseProdKey=RRAQU01&catOID=-8951&BV_SessionID=@@@@1437619151.1111005877@@@@&BV_EngineID=dfadddcjfejkibelgcgecfefdgf.0