This activity adds a more physical touch to your average everyday games of fetch; as mentioned above, get a hold of your dog's favorite food or something else with a strong scent and rub that scent off on a ball. But this time when you toss the ball and your dog chases after it, do a few push ups or sit ups in the meantime.
This activity is less physically intense than others, and is geared more towards the human caretaker, but will nonetheless serve as an excellent way for man and beast to bond; the next time you go fishing, bring your dog along (as well as a life jacket for your pooch) and enjoy the ambiance together.
German Shepherds are versatile breeds who are well known for their ability to adapt to various circumstances. Saint Shepherds have inherited a lot of that adaptability from their parents, so there's a high chance that your Saint Shepherd will take a liking to agility training activities after enough time has passed.