I ran a half marathon two months before dx. I felt so good two days after chemo #1 that I did a 6 mile training run. That was my last til I got better. I did not have a PEG tube ( my choice) and I had to replace every calorie I burned plus my target every day which was 2500-3000. I have seen some here say to keep working out but i couldn't. I did really well during tx because I was in good shape. As an athlete you know your body so I would say do what the doc blesses and rest when you're tired.

You can do this.