How many hours per week will you commit to get what you want? You might be asking for trouble with the amount of running it sounds like you do. This is what worked for me: 3-4x per week of Bikram yoga for a year put me in the best all around shape I have been in for 20+ years. I dropped from 175 to 160, and turn 46 this week. It's a huge time suck, but it's safe. For me, it's all about injury avoidance. (That said, I put my new conditioning to work playing soccer again, after 8 yes off the field.