Did you guys know that switching to a swimming exercise regimen has similar effects on your heart strength to spending time in space?

If a healthy person that did cardio regularly switched to only doing cardio through swimming their heart would weaken. No longer having to work against gravity during the cardio causes the heart to weaken.

Of course if you are going from no cardio to swimming you'll see improvements, this is for those that are already in shape.

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Metroids Suck

Life is so much better since committing to never run again

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