I grew up with retrievers and currently own Abrams, so they are what I know. And saying that, whatever kind of energy they have, don't mind it!
I think...exuberant is the best way to put it. Everything they do, they do with ENTHUSIASM. They don't over analyze, they don't ponder, they just barrel in without a second thought.
When Chloe (generic Collie mix) was a puppy, her actions had purpose. She would get overstimulated at times and get over threshold which would lead to reactive biting, but her energy always had a goal.
With Abrams, he's just all like, "I'M RUNNING BECAUSE IT IS FUN AND I LOVE TO RUN BECAUSE LIFE IS AWESOME AND THERE MAY BE FOOD AT SOME POINT. *crashes into the wall*"
But, he's able to focus and able to calm down. He's a dumb adolescent boy right now so sometimes focusing is HARD, but he does focus. There is a difference in him focusing than Chloe focusing. When he focuses, it is almost like I can hear the wheels turning in his head and it is taking so much concentration. With Chloe, she was more...intense?
Almost like a normal person in comparison to an engineer. Not that the normal person is stupid, an engineer's brain just works a different way. (I can say this because Michael is an engineer. I can look at the decorative beams of a building or watch Chitti Chitti Bang Bang and say, "Oh, how pretty!" or "Cool, a flying car!" while the only thing going through his mind is, "THESE MAKE NO SENSE!! WHY ARE THEY THERE?!?!" and "THIS IS ILLOGICAL AND COULDN'T POSSIBLY HAPPEN. HOW CAN THEY FLY AND CONTROL THEIR CAR WITH A STEERING WHEEL?!?!")