Pros & Cons of using your 6 year old as a training tool

So my husband and oldest daughter are in Oklahoma City for the Women's Softball College World Series. I'm home with Liv, our six year old.  Normally I head out early  for whatever crazy workout I have planned for the day and hubby is happy to be home with the girls.  So, I decide why not hook Liv's Trek to my mountain bike and head out for a hilly, challenging 8.5 mile ride through our beautiful mountain desert trails.  Although it wouldn't be a long ride, the climbs plus the weight of Liv and the Trek would be great resistance.  Now that we're back, I have come to the conclusion there are many pros and cons of using a six year old as a training tool.

Pros:
1.  Her short little bursts of furious peddaling on climbs actually gave my legs a few seconds of relief (however those bursts were few and far in between)
2.  48 pounds of kid is great resistance training
3.  2.5 miles into a 3 mile climb hearing her guttural cry of "I can feel the burrrrrrn baby, I can feel the burn!" made me laugh so hard I forgot momentarily about the actual burn I was feeling
4.  Picking up some speed on the downhills and hearing her yell "Oh yeaaahhhh...rock and roll!"

Cons:
1.  Pulling 48 pounds of kid uphill for miles
2.  Having to institute a No Question Rule While Climbing And Mommy is Breathing Really Hard after the following questions:
     -do lizards have thumbs?
     -what would happen if I fell off and rolled all the way back down the hill?
     -why was our town underwater millions of years ago?
3.  The question any parent traveling with a child dreads:  are we almost there?
4.  Her claiming that 'my butt cheeks are a lot sorer than yours' over and over


In all, a fabulous ride with my daughter.  I'll take both the pros and the cons for a great ride like that!