Do you want to only target the gym user? If not, I would not use the word gym in the name. Something this size could be used for many things, like the beach, exercise at home, meditation, or home use at the family poor or spa. You may want to consider these other uses in your name, so you can gain greater sales. You may also consider a name that would indicate mutliple uses. ???? You might also want to use a word in the name that indicates something larger than usual. Like Colossal, Grand, Atlas, etc. You may also think of words that refer to exercise, like heavy weight titles or awards.

Best wishes, Alena.