Incorporate some games into your daily walking it helps keep your dog interested, focused on you. This is useful if he's easily distracted, with a tendency to run off. Use your imagination and create your games, but be aware of weather conditions. The bad condition must be harmful.

How much exercise?
The amount of exercise of your dog requires each day will change over the years, but consider his age and also consider yours dog breed.
Working breeds such as Border Collies and Retrievers need more exercise than small toy breeds such as Yorkshire Terriers or Shih Tzus, which may be content with a walk around the block and a game of fetch in the garden. And you can take advice form dog vet about exercise.
Puppies are still developing and their pads are very soft, so aim to spend at least half your exercise time off hard ground. Avoid a game that puts pressure on his joints such as trapping a toy in the air. That game put pressure on his jaws and feet’s. Don't allow him to mix with other dogs up to the time when his vaccinations are complete.
Senior dogs may slow down and tire easily, but they will excite when the owner dose play game like retrieving a ball, but actually owner take risk of injury to the dog at that time. As your dog ages, be prepared to make games shorter and a little less boisterous. An older dog may become reluctant to go for a walking, especially in winter, but wrap him up warmly and persevere, as gentle exercise will help retain fitness.