What is the most strenuous exercise running or swimming?

Answer 1

it depends on how you define strenuous.

swimming is much better for your joints, as well, swimming probably uses more musles than running, as it is a whole body exercise.

when swimming, you are forced to hold your breath, which exercises yor lungs and therefore the rest of your body much more than if you were running.

there is also much more resistance when swimming (because of the water) making if much harder to swim a distance (ie.400m) than it would be to run it. (the world record time for 400m freestyle is 3:40.7, whereas, in track, it's 00:43.19 so obviosly, its alot more difficult to swim.)