The hour is not the same though. The hour in front of the TV is resting and recovering while the hour at the gym has a bunch of logistics, requires work to figure out an exercise plan, and then requires additional rest to recover from the extra effort.
Potentially your friend is happy with her choice to rest and recover from her day in front of the TV, but feels the need to feign gym-interest to you and society because of the peer pressure to accomplish everything, all the time, all at once. I'm sure she could actually make it to the gym if she actually chose to.
I'm all for championing rest and recovery in this truly overwhelming society we've created for ourselves.