Suki: the good, the bad, and the ugly

Suki is a mixed breed, believed to be border collie and jack russel or rat terrier. I adopted her off of craigslist at 14months old. It wasn't love at first sight, but I could tell her current owners didn't want her and felt that at the very least I could re-home her responsibly. I was her 4th owner by that time. The first day it became clear that Suki had received little to no exercise in her life time. She wasn't over weight, but had no muscle definition and still ran in a similar fashion to a puppy. She is also quite fearful, particularly of men and other dogs, her strategy is to bark loud, look tough, and put your hackles up to fend off unwanted advances. Suki also got very car sick earning the title Pukey Suki. I initially adopted Suki to be a flyball dog, but it soon became apparent due to her various behaioral quirks that flyball was not the sport for Suki.

Fast forward to almost 4 years later and Suki is still with us, and has been trained in canine disc and agility. Our continuing struggle is overcoming Suki's apparent ambivalence to physical activity. Suki is usually good for about 90 seconds of strenuous activity and if you're lucky you can get 10 minutes of training time in before she completely quits.

The good:
Suki LOVES food, she clicker shapes well and she likes to offer novel behaviors in the hopes of getting a treat. She is also very clever and has a very good memory (which also has it's pitfalls).
The bad:
Suki is timid, doesn't like to be touched, and she barks a lot.
The ugly:
Suki bites, and hard. While in my care Suki has bit and drawn blood on 3 men, all attmpting to handle her in some way.

During the winter off-season I will be working on increasing Suki's drive for both agility and disc.

Our specific goals for disc are to get Suki to the point that she will go through out 90sec routine 2 times in one day with a 2 hour break in between. This is prep for competition, if she ever qualifies for the finals she will need to compete 2x in one day.

Our specific goal for agility is to make it fun. Currently Suki plods through the course and occasionally stops at a jump and walks under it if she feels it's to much of a bother to go over it. I'd like to transistion her from food to toys, but as of yet I've not been able to get her to work much for toys. The ideal end result would be Suki smiling and running through an entire 20 obstacle course.