You can take your workout out of the gym and into the open air at Kiba Park. It's a great place to do a few pushups, squats or even some yoga.
This outdoor sports and fitness area is on the to-do lists of many travelers to Koto. But Kiba Park isn't the area's only drawcard. Tokyo Disneyland®, Tokyo Skytree, and Tokyo Tower are some other interesting sights nearby.