Are you in pretty good shape? If you’re 180lb, you’re doing the same amount of work to move 180lb through the water whether it’s easy, or hard. If it’s easy it may not make your heart work harder, but you’re still doing the same work/burning the same number of calories.
When I started lap swimming at the age of 45 it kicked my ass to swim a full hour of laps, but I’d burn 700ish calories doing so. After a year of consistent work I could swim a full hour without stopping, my lap times were faster, my distances were greater, but I never got winded and I was still burning 700ish calories in an hour.
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