May I respectfully disagree .....
As I've said before, ( and I'm a running dog man, not a Terrier man), a good working Terrier is not just an athlete, it's the canine equivalent of a Spartan, a Gladiator, it puts its life on the line every time it goes to ground, it goes into its enemies domain, down a tight tube, in the pitch dark to face a quarry that's fighting for its life.
I know Terrier lads who have their dogs so fit they put most lurchers to shame.
Be proud of the type of dogs you run........but don't under estimate others ?
Cheers.