Why is the last one always seem the hardest?

So this was supposed to be the easiest of the six hikes, not sure why it seem to be harder.  Could it be we did Wilson Mountain on Tuesday, October 1st and then hiked Cathedral Rock the next day.  Driving back from Cathedral Rock felt like my energy had been sucked out of me.  Always thought that the vortex’s were to give you energy, not take it. Anyway the views on Bear Mtn are well worth the effort of the hike.  Haven’t been on a bad one yet!