Can I tell you how strong and able I felt?! It was like I could do anything. I pushed myself so hard and I had the sweat to prove it. It isn't just physically challenging, but absolutely mental as well. So I'll ask, what are you doing that challenges you these days? Physically? Spiritually? Emotionally? Intellectually? (I know being a mother does this for me everyday.) If you can't think of anything, or if the answer is nothing, step up and find something that stretches you to your limit and then push yourself one step further. You'll be amazed at what you can accomplish.