Workout

Warm-up (500)
2 rounds
100 free/100 drill
100 kick

Set (600)
2 rounds
100 back on 1;45
4 x 50 kick on 1:00

Set (1800)
3 rounds
2 x 150 on 2:15
...100 free/50 non free 
4 x 50 free build on :45 
100 FAST choice on 2:00 

Set (300)
6 x 50's drill on :55
...catch-up stroke

Cool-down (200)
200 EZ choice