Swim Dry-land Band Demenstration
Dry-land band work is great for buidling swim specific strength away from the pool, but it's proabbly even better at working on the small catch movement without having to worry about actually swimming. This small movement of rotation around the elbow and engaging your lats is the key to a powerful swim stroke. And a stroke that is less prone to shoulder injury.
You'll see bands programed in your training from time to time, but this drill is something you can work in just about any day you want on your own. You don't have to do the full pulls to get the benefit. Just focus on the small first movement shown in the video. These are great to do right before you swim as it actiavtes your lats and helps teach mucle memory.