Source: Jake Des Roches 

The 2000 for time is an important test of aerobic/anaerobic capabilities.

Kids of all distance/stroke specialities can benefit from improvement in this capacity over time. It is usually the kids who are sprintier that have the biggest improvements, as planned endurance training for the inexperienced can lead to major physiological improvements.

It is important to celebrate athlete improvements when you do this again in the future (I generally do one in September/October and one in March/April). Following this 2000 today, we will do some 300s with the Urbanchek color times to introduce training paces to the kids on Monday.

In 2-3 weeks we will run a 2nd test of 10x300 Best Average @ 20s rest (subtract 3 mins for 3000 time, divide by 10 for 300 average).

Retesting is important, because it gives the kids who did a 2000 for the very first time a chance to improve simply by gaining experience. 

It will also give kids who were "off" that day a chance to test again. When you think about the two different results for kids, it can give the coach a very good idea of a kids "training range" so you can get an idea of their workout variance.

Jake Des Roches linked to FB group: USA Distance Revolution

I decided to put my 2000 for time this year at the end of our workout. Kids who've done them before complained a bit (generally I've done ~45-60 minutes warm up, then 2000 middle of practice) as they felt "we already did a whole practice" before starting the 2000. I wanted to get a 2000 test more similar to a longer freestyle set that happens at the end of a workout. We are also competing 5K open water this weekend, so I will be able to remind them that they gave a great effort on a 2000 after 1hr 15 mins of practice already.
Even with the change from our usual routine, I think we saw some pretty good results; most returning swimmers from last year seeing a 1.25 to 2 minute improvement.

Warm Up: 400 Choice + 12x50 Free @ :45 (turn skills)

4 Rounds: 1x100 IM Drill @ 1:40, 1x100 IM Swim @ 1:30, 4x50 V sprint @ :55

Paddles: 10x100 @ 1:40 2x(1 IM, 1 Bk NS, 1 Bk2Br fast br, 1 Br NS, 1 fast free)

Set Up: 3x100 @ 1:30 D1-3, 3x100 Blue @ 1:10/1:15, 100 easy

2000 for Time

600 Cool Down