Workout

Warm-up (500)
200 Free
200 Kick
100 pull

Set (400)
8 x 50 on :50 or 6 on 1:00
...descend 1-4 or 1-3

Set (900)
12 x 75 on 1:10 or 12 x 50 
…focus on stroke count
...d1-3 SC

Set (1200)
6 rounds
1 x 25 build on :30
1 x 50 fast on :50
1 x 25 ALL OUT on :40
100 ez on 2:00

Cool-down (200)
200 ez