Christa, I was going to ask you since you seem like you know a lot about this stuff (but anyone can chime in) As far as cardio goes I'm a champ. I can go for a long time, but when I walk on the treadmill I get a lot of pain in the shin area. Sometimes I use the incline, sometimes I walk faster or slower, but it seems to always happen. I stretch and I drink water. I can't tell if it's cramping up or what. Is there anything I'm doing wrong? Or should I work through the pain and eventually it will get better?