Absolutely. Adequate and stimulating - yes. Often breed-specific - yes.
But IMO Cesar will point to a dog who has been run off its legs on a treadmill and explain that all its behavioural issues are solved due to the exercise. Well, sort of... but it's calm and quiet because it's exhausted, not because it's cured.
I'm a huge believer in plentiful, appropriate exercise - all I'm saying is, the answer to ALL problems isn't ALWAYS "more exercise".
My dogs get plenty - but if I went to Cesar for help, no doubt he'd say they don't get enough. He'd have me being dragged, wobbling, on roller skates and spending half a day up a mountain and after all that I'm sure my dog WOULD be calmer. But the next day the problem would still be there.