You know how they're known as the 35mph couch potato? Well he has the 35mph bit down perfectly, it's the couch potato part that is broken.
He is permanently stuck on "Haven't been out yet so must bounce" mode. No matter how long we walk for 
Recall is also broken. I can successfully recall him away from people, children, dogs on leads and dogs walking to heel, but if he finds a dog who will chase him or let him chase them I might as well just go home and leave him to it
He played chase with a collie today. And a terrier. And a retriever. And just nothing. He spent 20 minutes splashing in a small pond created by a broken pipe. We were out for almost two hours. You'd think he'd be doing the couch potato bit now, no? Well he's not. He's playing chase in the house with the whippet.
Does anyone else have a dog who needs walking or training with for eleventy million hours a day?