The thing that challenged mne the most in the Militia was doing Ceremonial Guard with the PLF in Halifax a couple summers ago (after I did the MG course with our newest pointy-head Garett). It was a new idea, first time it‘d been run, and was given to a sergeant to organize and run. He had a couple Mcpl/Cpl‘s to help him and it was staffed by soldiers who wanted summer work or were between courses. Great summer.
However, since it was run by a sergeant, no officers around, no standards to meet, nothing, it was... revealing.
I think the easiest PT we did was 10km runs. For anyone who knows Halifax we did circuit training on the Commons, and relays up and down Citadel Hill. Damn, it was F**king hard! Pt was 1-1.5 hours every morning, and then the day began - drill, standing at attention for an hour 3 times a day, TCCS familiarization, playing on the FATS range, or polishing kit. Then downtown afterwards. Great summer, really challenging - and all because there was no standard, no officers, no oversight, and no interference.