Here's the answer:
“健身房就在这里”
(jiànshēn fáng jiù zài zhèlǐ)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
You could also say:
- jiànshēnfáng jìu zài zhè lǐ
- jiàn shēn fáng jìuzài zhèlǐ
Fun fact: the hundreds of thousands of people learning Chinese with Memrise get this phrase correct 92.68% of the time!