Two weeks is probably too soon to see energy returning. I finished radiation last September. As I recall by mid-November, I was back to some light exercise and walking on a regular basis. As I’m sure you’re aware, there is no formula that fits all. I was able to continue a regular exercise routine through the first six of seven weeks of treatment. Chemotherapy really exhausted me for a few days every week but then I could do some walking and machine exercise the remainder of the week.
The last week of treatment and first month after I really felt exhausted. Once I began to feel even slightly better, I forced myself to begin walking a bit every other day and worked up to 2 or 3 miles at a time.
Unfortunately I had some other serious health issues (not cancer-related) arise so I can’t tell you about further progress.