Your Silkese dog has a natural instinct to chase. Rather than try to suppress this (it never really works) utilize this trait and use it to keep them fit and entertained. If you want to get fit you could run around dragging a lure toy on a rope that your dog has to catch. Or if you get tired, revert to the long whip-like lure toy and flick it around on the ground for your pup to chase. Let your dog win occasionally or they will get disheartened. Build in a few rest breaks as the game is strenuous.
Did you realize that a walk for your dog is not all about physical exercise, but they also get a good dose of mental exercise with all that sniffing they like to do? It's true! As you allow them to stop and sniff the plants, trees or whatever, their busy minds are processing all the information they gather. It is their 'daily newspaper' that informs them about what's going on in the neighborhood. Teach them to 'go smell' which signals they have time to explore, and be patient as they investigate. Then walk on and repeat at a new place.
This activity is an old favorite but still gets your dog exercised, fit and trained, all while having a lot of fun. The newer frisbees have a softer edge to them which is easier on your dog's mouth when catching the toy. Try to catch your dog out by making a mock throw, and then change direction and toss the Frisbee in the other direction. Your dog will have to mentally adjust to this new variation and has to race to get it. This is not a game for a puppy though, as jumping can cause damage to growing bones.