Workout

Warm-up (900)
300 swim/100 kick
200 swim/100 kick
100 swim/100 kick

Set (500)
10 x 50 build on :50

Set (600)
12 x 50  on 1:00
... from mid-pool
...4 fly/bk, 4 bk/brst,
... 4 br/fr
...fast turns

Set (1000)
4 rounds
100 fr on 1:30
75 kick FAST on 1:30
50 build on 1:00
25 sprint on :30

Warm-down (200)
200 easy