You go swimming! We’re lucky one of our local pet stores has an indoor pool. Normy enjoyed 15 minutes tonight. We haven’t been in over a year yet his routine was still the same! It goes something like this,

I toss toy.
Norm runs into the pool.
Norm swims out to get toy.
Norm swims back with toy.
I trade toy for cookies.
Norm trots out of the pool, shakes, and finally runs/rubs all around the outside of the pool.

Repeat!