So probably doesn't sound like a big deal to you guys but I've been mixing in cardio lately. Yesterday I ran, albeit slowly (4.6), for 30 minutes straight, I wasn't even really tired probably could have done 40 or 45 minutes, if not more. It was quite the accomplishment for me because I've never been able to run more than 10 or so. In fact, before I lost weight I got to the point where I felt extremely winded after 3 (!!!) minutes at the same speed.