I know about their hips and I wouldn't say they get too much exercise.
They get walked twice per day for not longer than 20-30 mins.
the rest in the garden.

The breeder of the gsd advised us about their hips and said we have to make sure as well not to let him jump in or out the van when we travel and stuff. But I knew about their hips problem from reading about the dogs.
But she never said not to let them run or so... None of the breeders did.

Training wise they are doing great... Cobi starts picking up and understanding what I actually mean LOL he learned two new things in three days! Stay and leave! I'm happy with that
Maya is no problem at all to train... Show her once or twice and she knows!

Tomorrow he is going to training so will see how he goes on with other dogs