Why is the pool harder than the ocean??

Hi all!

63 year old male swimmer in Laguna Beach here. Question for the group. 

I swam this whole last winter in the ocean no wetsuit averaging 3 swims a week of between 1-2 miles each. According to my Apple Watch I was on a 1:40-1:50 pace for my 100’s.

wanting to diversify I jumped in our local pool the other day and thought I’d knock out a quick 3,000 yards and was absolutely gassed after swimming the first 200...

I have been swimming for 55 years-Age group, high school, college, ocean lifeguard. 

why so much harder in the pool than the ocean?

thanks!!

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