To strengthen a young Teddy puppy's body, you can take it to a grassy area and let puppies chase each other, play, roll, crawl, and jump. This kind of natural movement is excellent exercise.
Physical training should begin after weaning. At first, the puppies can exercise freely alongside their mother. Take the whole litter to a quiet patch of grass so they can move around naturally and build their coordination.
When a Teddy puppy reaches about three months of age, exercise can gradually shift to individual sessions. At that stage, you can increase activity appropriately, such as jogging with the puppy two or three times a day for about 500 meters each time. By four to five months, this can rise to around 1,000 meters per session. After six months of age, each running session should be no less than about 1,500 meters.
The speed should increase from slow to fast, and the distance from short to long. Start with interval-style running and move to a full continuous distance after the puppy has built some foundation. The goal is to provide enough exercise without causing fatigue. Besides running, you can also use natural terrain and simple training equipment to encourage climbing, descending, and jumping, as long as the height and width are easy for the puppy to pass naturally.