This is an honest question, with no snotty tone meant. What do the people who say there is no reason to ever break the leash law propose for exercising your dogs? Especially for those that the leash law includes not being able to use long lines.
I have a ridiculously energetic dog. At 7 or 8, she's finally calmed down to a normal dog level, but the first 3-4 years we had her (we adopted her when she was ~3 years old), we were going to the dog park every. single. day. I was really lucky in that there was a park 10 minutes from our apartment. Before I left work in the morning I'd set out clothes for the evening, and when I came home it'd be a 30 second change, then I'd immediately leash Lucy, hop in the car, and go to the park for 1-2 hours where she would literally run circles and chase other dogs for a solid hour straight. In the winter time, when it got dark early, I'd drive 25-30 minutes to the next town over to use their dog park that had lights until 10 pm.
She also got 3 walks a day through a park near our apartment. I woke up at 6 am to get her a 2 mile walk before work. DH walked her another 2 miles when he got home from work. I took her to the dog park when I got home, and then she'd get a quick 10 minute walk before bed.
On rainy days, we sent her to doggy day care to try to mentally wear her out.
Her energy level is also why we started doing agility. 1-2 nights a week we were in classes, which allowed me not to have to go to the dog park those days!
When we were doing work in the evenings or watching tv, we'd be training her to try to wear her out. We'd alternate who got to sit on the couch, and who had to sit on the floor working her stays and her relaxation protocol.
Now, at 7 or 8, she is content with an hour at the dog park 2-3 times a week, day care once a week (the day we both work late), agility twice a week, and a long daily walk (45 minutes or so). We also have a small suburban yard where she can chase the birds and squirrels that dare to land inside the fence.