I'm including images from the boxes, because it does a better job showing how to use these products than I'll be able to explain with words:
The Ab Roller is an interesting addition to our home gym equipment. As shown by the photo on the box, you kneel, grab onto the handles, and roll forwards, then back to your starting position. Both my Husband & I have noticed that while doing the exercise (2-3 sets of 10), it doesn't seem very difficult. However, the next day we both really feel it in our abs! I like it. My only complaint is that the knee pad that is included is too thin to be helpful. If you have your own mat at home, use that instead.
The Balance Board is more of a therapeutic tool, in my opinion. It's something that was recommended to me by my PT for rehabilitating my knee. The main idea is that you stand on it, and shift your weight side by side to improve balance and agility. You can also stand on it while to engage your core while doing upper body free weight exercises. I like the balance board for these reasons, but I'm not sure it's something every runner would appreciate. However, I did notice that Balance Board exercises were mentioned in the latest issue of Runner's World in conjunction with barefoot running, so maybe I'm wrong on that point.
America's Nutrition. And readers, go check them out! Both items arrived quickly and were well packaged well; I wouldn't hesitate to order from this company.