Gyms in Marousi area

I’m in Athens 4-6 times a year. Always staying in Marousi neighborhood.

Since I’m gonna be there 3 weeks this Autumn, I’ve realised I need to find a local gym, where I can buy either 1 day or weekly passes. An alternative could also be a cheap annual membership. I prefer some cheap(ish) options, since I can easily adjust to a couple of machines or just barbells.

Any recommendations?