a Gym Pacifico on Arlegui
Closed down, unfortunately
There is, however, a gym on I think about 8 Norte, just off San Martin, near the beach. Looks quite decent.
I've seen a few sweaty boxing type gyms in Valpo but nothing more.
I'm looking for yoga classes as well at the moment. Haven't got round to giving any a try yet but have found:
Yoga a luka do classes in Valpo and Vina:
http://www.yogaluka.cl/contenido/There are loads of smaller, but expensive yoga studios on Plan Vina. And a Pilates studio at the Libertad but Poniente end of 4 or 5 Norte. There's even Bikram Yoga place which I found on google a while ago.
The previous tenants of our flat left an exercise bike.. I might start using it!