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If you’re in need of a swim or a gym, Furatto near the station is excellent.
Entry is 520 yen and if you have a swim cap, bring it but they can lend you one.
Up one floor is a fully equipped gym with banks of machines and weights. Classes include Les Mills workouts, yoga, and dancercize. Most classes are included in the entry fee.
One thing though: to use the gym area you need indoor shoes that have never touched the ground outside. Tokyo Shoes near Coop supermarket has cheapies that do the job as well as popular brands if you’d rather take a new pair home. They also do duty free shopping.
Map and opening hours here: