It´s like if your annoying roommate was a fitness tracking app.
Here is app I heartily endorse.
Cakewalk is step-tracking app which nags to you and if you do not reach your goals it will publicly shame you on Twitter. As majority of New Year resolutions will be broken sometime you need a little bit of tough love to stay on the course. Otherwise it is super simple: it will set the goals based on your daily average step count and then insults you if you don´t fulfill your goals.
Probably someone will get upset of this “mean” app. Well get away from your smartphone and just go walking.