Workout

Warm up (600):
300 swim
200 kick
100 breast drill

Set (600)
6 x 100 
...odd: free on 1:30
...even: 25 breast/25 free on 1:45

Set(1800)
3 rounds
200 breast 3:20/3:10/3:00 by rounds
4 x 50  (25 breast/25 free) on 1:00  
100 (50 breast/50 free) 1:30
100 Free easy 1:40

Cool-down
200 EZ