Workout

Warm-up (1200)
300 swim
6 x 150 on 3:00
...odds- 50 kick on back/100 free
...evens- 50 back/100 free

Set (1800)
2 rounds 
3 x 100 on 1:30 
...50 back/50 free
4 x 50 free on :50
2 x 200 back on 3:30

Set (300)
2 rounds
3 x 50 kick on back
2 easy on 1:05, 1 fast on :55

Cool-down (100)
100 easy