If you're looking for workout motivation, a dog could be the best exercise partner you can have. People who have pets and are active with those pets tend to be healthier.
Playing with your dog causes you to move in different ways (backwards, forwards, sideways) and at different speeds, almost like interval training. Exercising with your dog can have mental benefits, as well as physical ones.
If you're just getting started think about buying news shoes for yourself and a new leash for your dog as an incentive.
Make sure to get the greenlight from your doctor before starting any new workout routine.