Can you not put the phone to sleep while using this app?? I used Cardio trainer for the first time a week ago and loved it. Worked great for me the first couple times I used it. Went to use it again tonight in my neighborhood, and the GPS tracker doesn't seem to work. Kept track of my time, but not how far I went or how many calories I burned or how many steps I took. Is it because I manually put the phone to sleep after I started the workout? I put it to sleep so when I put it into my armband it wouldn't hit a button and mess up. I can't remember if I put it to sleep the first couple of times that I used it. Also, anyone know how to get it to calculate elevation into your workout? My route included a lot of steep hills and didn't know ifi I could figure that into my workout. Thanks to anyone who can help!