One of the people we traveled with in January purchased a week pass at La Cabana's gym - I think he paid $35 for the week.
There is also a gym near Certified Mega Mall on LG Smith Blvd. It's on the 2nd level in the round building which I THINK has Delifrance in it (not sure). Someone else may be able to confirm this. Our friend also went there a couple of times.
You should go to 2bfit Studio. It's a brand new gym situated close to boroncana and the hotels. They have a weekly pass for $40. 2bfit Studio is a brand new concept where you will get personal training and a great workout. They have all new equipment and machines! The director, Mr. Pieternella is one of the most famous body builders, personal trainers on the island. Professionalism is what sets them appart.
It's right next to the bowling alley, the new water park and pizza hut.
I go there almost every day and it doesn't get boring!
Another question I need to ask for my DH. We have become hooked on indoor cycling classes (spinning) at our local gym. He is wondering if there is anywhere on the island that offers cycling classes. I cannot understand why he wants to know this - the last place i would want to be when in Aruba is inside!!! I plan on getting all of my exercise outside.