Thornback Cowfish

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Warm Up
None! Go right ahead into the main set.

Main Set
2x through:
5×100 free swim @ b +10
4×200 free swim @ b -5
3×300 free swim @ b -15
2×400 free swim @ b -45
1×500 free swim @ b -1:05
2 minutes rest between rounds
If you want to challenge yourself even more, you can drop the bases on the second round.
7,000

Main set via

Technically a kind of boxfish, this guy has horns at the top of his head, but doesn't use them to bully others. However, in stressful environments—or if it dies—the thornback cowfish can become toxic.