Probably by now you are not going to the gym. Most of us got so weak and/or fatigued we had to plan our day around the best time to sit in the shower. Calories become precious commodities as treatment progresses. You will need them for basic life support.

It's a bummer having to start over at the gym after an extended time off but it is what it is.

I would also have concerns about infections you could acquire in gyms (or any other public places for that matter) with a crashed immune system.