Were the Roman army in good condition since the had to walk for long periods of time
I assume that they did rest for a few days before continuing their long journeys, but yes, they probably were.
The Roman army trained very hard every day at running,javelin-throwing and sword-fighting.They sometimes went on fast route marches of 30 kilometres (18 miles), which they covered in five hours. They had to be able to build a temporary camp at the end of the March. Hope this info is useful