Piestewa Peak is okay if you want a quick cardio work out! What I like about this hike is it's local and easy. If I want to get outside and do something active, I'll choose Piesteway Peak or Camelback.
What I don't like about it, is it's heavily populated and not all people have the ability or stamina to hike this local hike, thus if the trail gets narrow, you're stuck behind someone.