Going on a walk works for my mind, I can think really well walking or hiking. But more intense exercise without a novel mental aspect (i.e. a game) interferes

Going on a walk works for my mind, I can think really well walking or hiking. But more intense exercise without a novel mental aspect (i.e. a game) interferes with my ability to think hard and I find myself constantly frustrated and/or bored. Now if I could go on physical exhausting, mentally entertaining, medieval quests in the real countryside that would be great. Maybe sunshine, Vitamin D and augmented reality are waiting in my future.