I use the Le-Vel THRIVE Experience - Men's Lifestyle Pack! I've been on it for 3 weeks and on my 2nd week of c25k. I lost 11 pounds my first week on the Thrive and have had 0 trouble(knock on wood) while doing the c25k this time! I tried 3 years ago at age 52 at 230# where now I weigh 231and couldn't do it. I would get so out of breath and be so weak I couldn't get past the 3rd week staying on (week 3) 5 times. I'm at (week 2) day 2 this time and feel like I'm 30!