On the surface, selling open gym and 24/7 keycard access sounds like a great way to make some extra money. But in reality, it's more likely to cost you—now and in the future.

It presents issues with liability, security and safety, all the while limiting your earning potential (no one's going to upgrade from access to personal training, but many won't hesitate to downgrade).

Not convinced? Here's Coop on what happened when he tried selling access, what the top-performing gym owners have to say about it, and how to decide if it's worth the trouble.

Links:

Gym Owners United

Timeline:

1:16 – Lessons from Coop’s past mistakes selling access.

4:58 – It costs more to sell access than selling access brings in.

6:03 – Downgrades and weed clients.

13:13 – Top-performing gym owners on the 24/7 question.

15:52 – The added risks and problems with keycard access.

18:24 – Still tempted? Do the math.