You see, even wanting one couldn't help you much here, your question is way too much unspecifical.
For the time being, I can suggest you to open a terminal and do something like
Single out the wireless interface, it is usually wlan0 or ath0 or similar. I assume it is wlan0. Then do
and choose the access point of your gym.
To connect, it should suffice to do
iwconfig wlan0 essid <your gym network name> key <yourpassword,ifany>
If the one above succeeds (you can check issuing iwconfig), then you're almost done, just issue