Workout

Warm Up (600)
12 x 50's on :50

Set (900)
3 rounds
100 Drill on 1:40
200 Swim on 2:40

Set (1200)
3 rounds
100 Build on 1:30
250 hard on 3:00
50 easy on 1:30

Set (600)
6 x 100 on 1:30
...descend 1-3, 4-6

Cool-down (200)
200 easy