Originally Posted by nico-t

you can't compare running to stay fit to marathon training. Running marathons regularly and seriously is bad for your health, period: Look how the top marathon runners look.

Everything you overdo is bad for you, running is not an exception.

I run once a week & do strength training 2 times per week which seems to be the perfect schedule for me. Just run outside, the scenery changes, not like a rat in a wheel.

PS - i used to cycle (and swim), but to get a good cardio training doing that you gotta sit on the bike for hours until you're beat. Running gets this result 4 to 5 times faster.
Swimming got very boring to me, very fast. Running outside no matter the weather is by far the best option for me