Pick something about their form to copy and see if yours doesn’t start getting better, too. Even better, copy their “effort” — see how they’re keeping their shoulders relaxed, or just gliding through the pool? Channel that.
For me, it’s a lot easier to complete a run workout if I do it as Paula Radcliffe than it is if I do it as me. Yep, it’s a head game, but you’ll be surprised at what it can do for your body, too.