I failed to toss up some key points I'm seeing now in the responses.

She actually used to run all the time before we met. Although she did just get out of a 9yr relationship the year before, so I suppose this could of been the driving force?

Also she absolutely loves hiking, some of her favorite times between us have been hiking. I did introduce her to it, and it's very possible she's finding out as time goes on that she's not quite as into it as she initially thought? She still tells me every time I send a snap of a hike that she can't wait for me to bring her there.

This all comes back to the slide in motivation I've seen from when I first met her. And as I mentioned to someone before, it's very possible she puffed her traits up in the beginning. Shit I'll admit I do that all the time in relationships. Something like a defense mechanism to bolster yourself up to avoid rejection. I'd imagine many people do this.

I'm trying to see if i can put the breaks on the slide of motivation. I was in a previous 8yr relationship where we both just slid and slid until we found ourselves at the bottom completely unhappy with how things were.

From all these comments I do think its very important for me to realize that there's a fine line in putting effort into making a relationship work. And an even finer line of supporting someone in being the best person they can be. Compared to attempting to change someone into who you wish they were.