Tonight we started the Couch to 5K week 4. After a 5 minute walking warm-up it's 3 minutes jogging, 90 second walking, 5 minutes jogging, 2.5 minutes walking, then repeat. I felt great the entire time. I only got a stitch at the very end. It's amazing how well my body is adjusting and that I'm actually enjoying the training process. I hope it continues.