I would like to find a gym/health club near the Acropolis for a few days next week. Anyone have any recommendations? Thanks so much!

Interesting question....
After a research, there are no gyms in the immediate vicinity of the Acropolis.

The nearest ones that i could locate are :

Personal Training PLaces
Vasilissis Sofias 51 ( opposite of the War Museum)
http://www.personaltrainingplaces.gr/

Holmes Place
Voukourestiou & Stadiou 4 ( in the City Link building where there is also the Attica Department Store)
www.holmesplaces.gr
2103259400

Jow Weider
Dragatsaniou & Stadiou
2103221458

Soma
Vasileos Georgiou B 27
2107254670

Silhouette at Syntagma Square
It is a place for people that want to lose weight, but it has
a Gym as well.
http://www.silhouette.gr
Mitropoleos 3
2103232986

There are also the Gyms of the Grande Bretagne and Hilton hotels, i think the Athenia Calirrhoe Hotel, which is very near to the Acropolis area has a small gym as well.
All others are not far away, and can be reached on foot.

Some of them can be reached by walking through the wonderful National Garden

Small correction

It is Joe Weider
http://www.joeweider.gr unfortunately only in Greek...

clausar,

Again, many thanks! After a few days of eating and drinking in Athens, I might need the one close to Syntagma Square!

Good gym is the one that provide personal training classes and personal attention to each and every member. Try to look for the same.