Yes, cruising involves a surprising amount of walking, and many travelers are shocked to find they log 10,000 to 15,000 steps a day just staying on the ship. Modern "Mega-ships" like those in the Royal Caribbean Icon or Oasis classes are over 1,100 feet long—the equivalent of three and a half football fields. If your cabin is at the "Aft" (back) and the theater is at the "Forward" (front), a single trip across one deck is a significant trek. You will walk to dining rooms, pools, and various entertainment hubs multiple times a day. Furthermore, "Port Days" add a high-value physical challenge, as you may walk several miles exploring cobblestone streets in Europe or sprawling tropical resorts in the Caribbean. For those with mobility issues, ships offer accessible routes and elevators, but for the average guest, comfortable walking shoes are a peer-recommended essential. The scale of these "floating cities" means that while you are on a relaxing vacation, your legs will certainly be getting a high-intensity workout throughout the week.