I'm not impressed with #7. I would like to see more color and I think the graphic portion would be too small on business cards.
#6 is a good use of color.
I really like #5. I like the use of color and I love to way you've incorporated the components of the triathlon.
I would like to see if you could use a third color. For example, one color to represent swimming, one for biking, one for running. I'm not sure if it would work, but would like to see it.