The trek is rated moderate and any reasonably fit person should be able to cover the route. It is fairly challenging nevertheless, and altitudes of 4200m are reached, so ensuring that you are well acclimatized is important. If arriving from sea level, plan to spend at least 2 full days in Cusco ( 3 days is better ) prior to commencing the trek. This should allow plenty of time for acclimatization and give you sufficient opportunity to visit the City of Cusco and nearby Inca ruins at Sacsayhuaman