You can take your workout out of the gym and into the fresh air at Ukima Park. It's the ideal place to do some situps, stomach crunches or maybe even a little yoga.
You'll have sightseeing choices galore when staying in Itabashi. Ukima Park is a great place to begin here, but there are loads of other worthy places to discover. Waseda University, Sunshine City Shopping Mall, and Chinzan-so Garden are not far from the outdoor sports and fitness area and and will cap off your day nicely.