We were told to do what you feel comfortable doing. Since my husband normally played 90 minutes of Pickleball a day and golfed one day, he has continued it. So far there has been no decline in how he has felt, yet he has only had two series of Chemo treatments with immunotherapy , for 3 days a week , every 3 weeks. He goes again January 26th. While his blood counts are changing, it is likely his energy level will too. He uses spay B-12, and is eating well , along with the exercise, seem to keep him feeling fine so far. We are grateful, yet know things are likely to change.