The time to read is any time: no apparatus, no appointment of time and place, is necessary. It is the only art which can be practiced at any hour of the day or night, whenever the time and inclination comes, that is your time for reading; in joy or sorrow, health or illness.
Most medical physicists work in the physics of radiation oncology making sure that the desired dose is given to the cancer and the dose to normal tissues are minimized.
I cannot bet my life on it, because I was not involved, that Alex Rodriguez ever used steroids. But in my opinion, I suspect he has, yes.