I’ve never been to a gym.

So I’ll die 5 years earlier than you. Send me some flowers at the funeral, will ya?

But I’d sign up for a swimming treadmill gym in a snap.

A good one costs about $25,000.

With $100 monthly fee, 12 hours a day, 4 slots per hour, it takes less than half a year to recuperate the device price.

There are of course a lot of other costs (rent, electricity, water, repair, staff, etc). But if you can get a volume discount on the device and flexible plans to get more people to join at lesser fee, it may look like an ATM after a year or so.

If you have a few million dollars in your mattress, leave a comment.

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