S.G.
I applaud you wanting to get back into it! I think everyone falls off the wagon now and again.
This is not to sound mean, just blunt:
Don't talk about how you're not working out. Don't talk about being unmotivated. Don't even THINK "Oh, gee, it's been six months since I worked out." Just do it. Stop thinking. Right now!! As you are reading this!! Get up and do 10 jumping jacks. Do 3 push ups (not the girly kind either). Do 10 crunches. Take as long as you need. I'll be waiting right here.
Okay, are you back?
Congratulations, you just DID SOMETHING!! And that something is better than the nothing you have been doing!!
Doing nothing begats doing more nothing. And doing something begats doing more something. Don't think so much and DO more!!
Sorry if I'm sounding like a crazy person here, I just finished a workout myself and maybe the old adrenaline is a little high and the blood sugar is a little low.
Good luck! I'm proud of you!