Thank you for using the Jiskha Homework Help Forum. "Listen to your body" is a good rule of thumb. If there is pain, your body is trying to tell you something!
2. (part II of #1): http://en.allexperts.com/q/Jogging-Running-1648/Pain-legs-running-1.htm
NOTE: Analyze the shoes you have. Are they giving you sufficient support? How are you landing on your foot?