Negative splits and pace work.
With triathlon season just beginning, here's a workout that will help you develop a sense of pace (the negative-split portion) and will help you develop a feel for how to hold on to your pace even as fatigue sets in at the end of a race (the 100s-on-short-rest portion). Those swimmers with longer races in their future might want to increase the number of 100s to 6 or even 8.
This workout can also be used to work on stroke, e.g., you could swim the 400 as 50 free/50 stroke...and the 100s as 25 free/25 stroke.
Total yards/meters: 1800
1 X 400 negative split (second 200 is faster than first 200) on 45 to 60 seconds rest
4 X 100 strong effort but on short rest (a sendoff that gives 10-15 seconds rest or 20 seconds rest if you're throwing in some breast or fly)
100 easy recovery, choice
1 X 400 negative split on 45 to 60 seconds rest
4 X 100 strong effort on short rest
100 easy recovery, choice
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