When we prescribe a medicine, we need to be a bit more perspicuous and precise. A proper prescription for any medicine must specify the formulation, route of administration, dose, frequency, and ideally the therapeutic targets and duration of that medicine.
Strangely enough, a proper training program (as opposed to merely exercising) specifies exactly the same parameters. A proper training program specifies exercise selection (formulation and route), loading and volume (dose), frequency (training days) and therapeutic targets (performance and body composition goals).
When it comes to exercise medicine, the prescription is a program. Anything less will not do.