So you've got a successful gym business. You're paying the bills and making a nice profit, too. Time to start another business and double your money! — Hold on a sec.

Chris Cooper is no stranger to starting businesses, and in his original book, "Two-Brain Business," he describes your first business as the cornerstone to a larger platform that you can build.

But what he didn't mean was to go open a coffee shop, pizza joint or even a yoga studio.

Here, Coop offers guidance on when to start a second business — and what that second business should be.

Links:

Gym Lead Machine
Forever Fierce
Gym Owners United
"Two-Brain Business"
"Founder, Farmer, Tinker, Thief"
"Gym Owners Handbook"
Two-Brain Coaching
Two-Brain Programming

Timeline:

0:36 – Why Coop is rewriting “Founder, Farmer, Tinker, Thief.”

2:11 – Why most gym owners should not start a brand-new business.

4:54 – The key middle ground.

6:03 – Why Chris started Two-Brain Coaching. 

8:37 – Why Chris started Two-Brain Programming.

13:29 – The question you need to ask yourself before you start another business.

15:48 – What Chris is working on now.