FITT principle: Frequency, Intensity, Time, and Type.
They can increase their exercise from 3 days per week to 5 days per week. They can aim for a further distance during their exercise. They can increase the daily time from 20 minutes into 40 minutes. They can change the exercise from jogging to running.
I think c would be the answer
Doctor's can't do anything to stop the bacteria from spreading. There is no treatment. It is likely to kill you.
I hopes this helps! (:
