The Fitness Center at PortoBay Teatro
Hotel Teatro Porto's fitness center is referenced by expert writers. Out of 10 reviews that we tracked, 3 mentioned the fitness center, such as Oyster, Concierge and Fodor's.
PortoBay Teatro 
 Oyster
 Concierge
 Fodor's
 "The hotel has a well-regarded Portuguese restaurant, stylish cocktail bar, and fitness center, and includes a free top-notch breakfast buffet" 
 "The hotel's Palco Restaurant (meaning "stage") and Plateia Bar ("tribune") are arranged around an inner courtyard, and the sixth-floor gym has views so good you'll hardly notice you're working out" 
 "Just one suite with a private terrace has a city view, but so does the gym—and all guests have access to the patio"