I'm just a regular person.  I did, however, find challenging exercise a life changer. Not only did I take classes to know why I stopped hurting and why I felt so good, I joined Toastmasters to spread the benefits of exercise and, as a project, I actually created this website called grateful4burpees.  Life is funny, you just have to listen to your heart, your body and your God, if you have one.  I know mine got me here.  Currently, I'm not certified in anything, but you don't have to be an expert to suggest someone watch a good movie or eat at a great restaurant.  We always recommend things we like to our friends and family.  I highly recommend exercise, especially if you're over 50.