I originally had planned on making this the toughest practice we've done in a long time, but instead we are just going to do a classic.
500/400 swim
300 /200 pull
200 social kick
4 x 25 sprint cycle
-----
3/2 Rounds of:
4x100 IM or free
Descend the interval each round.
How little rest can you succeed with???
-----
8 x 50 drill/swim
-----
200 swim