Mine are fascinated with moles, creating numerous Whippet-muzzle sized holes throughout the yard. A friend's young Whippet had an obsession with her camellia bush, jumping up each day to snatch an open blossom. He'd then run around the yard with his prize. Despite all their athletic energy, Whippets are, generally, no problem to walk on a lead. Most of them don't like the pressure against their neck if they pull.
Whippets benefit greatly from regular exercise.
Walking or jogging is ideal for both dog and owner. It is imperative that Whippets always be leashed when outside. Their prey drive can kick in at the mere sight of a squirrel, or even a piece of paper blowing in the wind on the other side of the road. Once the chase instinct takes over, they are oblivious to commands to return. More Whippets have been killed this way than probably any other way.