It is when the website repeatedly states travelers are expected to walk several miles a day and stand for periods of time. It was disappointing to have to slow the pace of the tour for one person who shouldn't have booked at that time.
"6. These tours are very active.
Our tours are not for everyone. They are very active — physically and socially. They're designed for energetic and curious people who are ready for the experience of a lifetime.
Museum tours, guided neighborhood walks and occasional hikes all add up to lots of time on our feet during the day. Afterward, we relax at dinner with lively conversations."
"What are the physical demands of your tours?
Our tours are physically active! Expect to be on your feet, walking and standing, for up to three hours, indoors and outdoors, and in all weather conditions. You'll also need to carry your own luggage, often up several flights of stairs."