Change Your Body Shape Book
I used my Swiss ball during my workout this morning. The Sports Injury Clinic has a page of Swiss ball exercises. The site has information about knee pain, too, and I know the answer to most problems is to rest so I'm taking a day off from running today.
I reached a new high for holding the plank today: three minutes. I think I was only able to stay on my elbows and toes that long because it was my first exercise of the day. Kind of seems like cheating!