There's a fitness center inside the ANA Intercontinental, with Upright Bike, Recumbent Bike, Cross-Trainer, Treadmill, Multi Gym, Abdorminal Work Station, Flat Bench, Dumbell & Rack.

It costs Y1500 to use.

Tipness Roppongi is up by Roppongi Hills, but I don't recall them having a daily plan - and it will probably be more expensive. From what I recall, Esforta and other nearby gyms require a monthly membership payment, and did not have a "guest plan."