The PPP’s key learning from this post is that you may benefit from less thinking and more doing. I mean this in the kindest way. Your opening sentence is the giveaway; that you are waiting for 2017. To me that indicates a lack of commitment, you know the kind: “I’ll go on that diet after Jacko’s wedding, I’ll give up smoking on the 1st of July.” Stuff with a clause = talk is cheap.
Here is another thought for you:
If not now, when?
Join a gym tomorrow. Or better yet, get into some open space ( yeah I know it’s cold but so?) and do something now!!! Right now.