Tokyo >> Roppongi
Roppongi is a popular area for nightlife, with many restaurants and bars. This area is also upmarket, and local gym day passe is very expensive. However, there is one resonable gym. See my recommendations below the map.
Below gyms (Red icons on the map) sell a day pass to travelers in this area. Roppongi is an upmarket area, and all gyms are very nice, but its day pass price is more expensive compared with other area in Tokyo.
Tipness Roppongi: Open Weekday 7.00-23.00, Sat 9.30-22.00, Sun 9.30-20.00. Day pass costs JPY2400 per visit. See the official gym website.
Data Fitness: Open Mon-Fri 10.30-22.30, Sat-Sun 8.30-18.30. Day pass costs JPY5500 per visit. See the official gym website.
Orange Gym Rats by 4GS : Open Mon-Sun 6.00-23.00. Day pass costs JPY5000 per visit. See the official gym website.
Total Workout Roppongi: Open Mon-Fri 7.00-23.00, Sat 8.00-20.00, Sun 9.00-18.00. Day pass costs JPY7700 per visit. It is a great gym but the most expensive day pass in Tokyo. Many celebrities are going there. See the official gym website.
To avoid embarrassment and disappointment at the gym, please read these Tips and etiquette before going to the gym in Japan.
Recommendation: Clear winner in this expensive area is Tipness Roppoingi. Great gym only for JPY2400 per visit. The location is also great.
If you are a Anytime Fitness Member in your home country, you can use 1100+ Anytime Fitness gyms in Japan for free. Check out the locations of Anytime Fitness in Tokyo from here.
Roppongi is an upmarket area, and many hotels are expensive. However, this 5-star hotel is still reasonable in comparison with others (I call it 4.5-stars). Mitsui Garden Hotel Roppongi Tokyo Premier is in the middle of Roppongi and has a small fitness room with some cardio machines. Most importantly, it is right next to Data Fitness. You can walk there in 1 min. Check out the review and price from here.