IMHO mrtsi. I would keep my dogs private as possible from John Q Public. There are way to many people with smart phones. These smart phones have excellent cameras to boot. Would be safer to find somewhere out of the city to exercise your dog. If drive is not to long will get the dog use to be ridden in a car etc.

City dwellers can be at a big disadvantage over a person that lives out in the country. That have access to back roads/trails and own larger tracts of land. If you own enough property where you can build a 30 by 30 foot lean two. A large 20 foot across round table/carpet mill/top of the line treadmill can still do wonders in shaping a dog. If you have a quarter of mile around your property line is enough to do the chain pulling.

Learn how to set up your routine doing sets of aerobic and anaerobic work. Rotate mills with the chain pulling. Will shape your dog nicely. One thing I learned over time is you have to have top notch well made equipment to properly work a dog. The right amount of land area helps a bunch as well. Cheers