Yes, Endurance House
Athletic shoes are sold at Marshall's and DSW.
No right in greenway, but close to are DSW and Endurances House
Endurance House is located in Greenway Station and they have athletic shoes. DSW may also have some athletic shoes. Although it's not in Greenway Station, you may also want to check out the nearby Fleet Feet on Old Sauk.
There's a DSW located right next to Michael's at this plaza. It is directly north of Biaggi's.
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