Just found out about and joined Myfitness Pal! I am also starting a 10 week walk/run program today. Up until my 40th birthday, I had always been around 125-130 and a size 7. Now at age 45 , I am at 171 lbs, and a size 12. I do not like the size I have become. I am always tired, never have energy to do anything. I need to…