I'm not sure if you're delivering that line straight, or sarcastically, but this is actually an important problem I've had to explain to to my doctor. I initially started a year ago on an ADD medication that worked very well, but only if taken every day. It takes about two weeks of utterly consistent usage to reach proper effectiveness, after which it's very good at what it does. If you miss a single day, it flushes out of your system and you have to start the two weeks again.
This makes it fucking useless for treating ADD, because ADD (among other things) makes it very hard to maintain consistent schedules, so those two weeks are more like 6 weeks, because you keep missing a dosage. Once you make it to the effective stage, better avoid going out on the town because if you get a hangover and sleep late you can't take it in the afternoon or it'll fuck with your sleep and now you've reset the clock.
When it comes to exercise, god damn is exercise boring for me. I can physically exercise for a long time, but mentally I can do it for about 10 minutes before I'm out of focus and ready to build statues out of paperclips just to have something to do. Yes, I've tried audiobooks.
I can see exercise working very well as a force multiplier a correctly managed medication, allowing people to keep their dosage low enough to avoid side effects while still getting the benefits.
However, asking people to exercise their way out of ADD is kinda like asking them to exercise out of depression. You need something else to get the momentum of the process rolling first, or the "static friction" of the condition is going to prevent the exercise from happening in the first place.