The size of Planet Fitness' (PLNT) store base is becoming pretty buff. 

The discount gym operator known for its no frills workout environment now has more than 1,500 locations open around the globe. CEO Chris Rondeau told TheStreet he remains confident Planet Fitness could get to 4,000 locations over time. While a good bit of that growth will come from the U.S., a chunk of it will happen from overseas as well. 

To be sure, investors are betting on that heady store target coming to fruition.

Shares of Planet Fitness have surged about 65% in one-year's time amid consistently strong sales and an impressive number of new openings.  

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