Perhaps those people ought to instead try something easier; like performing cardio vascular surgery.  

About two weeks ago I needed podcasts to listen to while doing cardio, so I searched real estate and BAM, BiggerPockets came up.

Do cardio and weights (not just cardio)4.

If a 'spandex warrior' has ever ran your son off the bridge shoulder cursing because he was in a hurry and getting his cardio on, you wouldn't consider it as happy experience either. 

You also get great cardio, by using the whole body.

I would be surprised if Lebron regularly did more than 60 minutes of elevated cardio a day (including game days).

Outdoor features include a large BBQ area with wet bar, the Boiler Room is a two-story brick warehouse space that has been converted into a modern gym with state-of-the-art fitness and cardio equipment.

I have never been so optimistic, carefree, and motivated as I am now (big part of this is daily gym/cardio)Being a landlord is NOT the job for someone who wants to make everything out of their time in this life (fitness, travel freely on your terms all over the world, time with family and friends, meditation/time to reflect, learn languages).

I can also tell you from experience that whether you are outdoors or not, if you breathe in enough carbon monoxide, your cardio vascular system will be compromised whereby you may start to get dizzy, nauseous, vomit and pass out.

From that I moved on to cardio therapy.