Some years back I'd managed to get myself into quite a state. Years of failed low-fat, low-calorie diets, and endless hours of moderate-intensity cardio had pretty much ruined me. I couldn't run, I couldn't even walk for more than a couple of hundred yards, without chronic back pain forcing me to stop.
Two things changed things for me, Gary Taube;s book, Good Calories, Bad Calories
, and Arthur Boorman's Never, Ever Give Up video:
So I started a low-carb, high fat diet, and ordered Diamond Dallas Page's DDP Yoga
something like 70 pounds in nine months. My back pain went away almost instantly. After that first year, I pretty much gave up on the yoga - I'm currently doing weight training to keep in shape. (I occasionally do cycles of HIIT sprints - I'm never going to jog, again.)
But, and it's a big but, doing yoga that first year did me a whole lot of good, and it's something that I will always fall back to, when I'm in circumstances where I cannot get to the gym.