re: Considering swimming laps to get in better shape..input needed

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I'm time crunched (40 min)

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If I am in a bind like that, I usually opt for a 5 min WU and 30:00 MS and a 5 min CD.

30 minutes of 100s on something you could swim for 40 minutes at a hard effort.

100s would be faster than that but offer 3-10 seconds rest. They start out easy, but really start to challenge you as the set progresses.