I'm a former gym rat. I used to trek to the gym every day to run 4 miles and lift weights. Then my knees decided they didn't like running every day and bellowed at me in pain pleading me to stop. I finally acquiesced when I found a way to work out without punishing my knees and still getting the sweat and results I craved. Now my new go-to is workout videos. And Jillian Michaels is what started it all.