As a 50 freestyler do you ever train aerobically? How often and how much yardage? Could you share an example of aerobic set suitable for sprinters?

I do shorter distances aerobically with short intervals and higher intensity, rather than the classic 10, 20, 30, 40 hundredths on interval approach. This helps keep me connected to my sprinting stroke.
 
Transcript: "I do train aerobically, but it's not the classic set up of 10, 20, 30, 40 hundredths on interval. I do shorter distances on very, very almost nonexistent intervals and on a little bit higher intensity. When you spend too much time swimming, let's call it doing a hip-driven swimming just like gliding on your stroke, you end up out missing that stroke in your brain. So it takes you completely away from your sprinting stroke. So I believe that you would need to spend as much time as possible connected with this type of stroke. That's why I only like to use shorter distances and shorter intervals so you can make it a little more aerobic. But if we're talking about going 3k, 4k, 5k, it's been years and I don't do that."