I'll join the challenge this year.
I have always been extremely tight in my hips and hamstrings (and shoulders, though I notice that less), so this year I am going to put focus on mobility. My athletic history is mostly soccer and running, lower body stuff. I have already been working on this for a couple of months and hope to build on my progress in 2017. I have never been flexible and wonder how much is even possible in my body -- it honestly feels a little hopeless -- but I intend to find out this year.
I would also like to improve strength, but it is definitely a 'second tier' goal.
My specific goals are around mobility and strength. I do intend to continue to run and play some soccer, but don't feel a need to set goals there because I thoroughly enjoy running and soccer. I do not enjoy yoga or strength training, but maybe that will change at some point. I remember there was a turning point in my running when I was just starting, where it felt miserable for many months, and then it wasn't.
For mobility, I am doing yoga at a studio and using a foam roller and lacrosse ball and other stretches on my apartment floor. For strength, I am doing the 'recommended routine' from the bodyweightfitness subreddit (google will get you there if you're curious and if it's not already in the resource post).
I track everything in the Garmin system. I use a Garmin Vivoactive HR watch and really enjoy seeing the steps, miles run and biked, etc. I can also track yoga and strength there, though not as elegantly as running and biking.
Front fold: Lay hands flat on floor with legs locked. (Now: can just barely touch my toes)
Full deep squat with straight back and no discomfort or balance issues. (Now: can squat with feet flat, but my back is hunched and I am almost tipping over backward)
Sit cross-legged with straight back and no discomfort. (Now: sitting cross-legged lights up my outer hips. I am forced to hunch my back, and it still feels like I am going to tip over backward)
Sit on floor with legs in front and back straight, relaxed. (Now: I can sit on the floor with my legs straight in front of me, but my back is hunched and my hamstrings are already fully tight. My abs must be engaged significantly to stay upright)
3x8 pullups (currently 7/4/3)
3x8 ring pushups (currently 5/4/3)
3x8 ring dips (currently chair dips 8/8/7)
Yoga average 3x per week (156x in 2017)
Bodyweight fitness recommended routine average 1.5x per week (77x in 2017) (I expect to have some on months of 3x/week and off months of 0-1x/week, hope to average 1.5x)