What is the concern of the field of biostatistics?

Biostatistics is concern with statistical data relating to living organisms that answer research questions in medicine, biology and public health. 

Moreover, it is a tool that gives us answers on things that are uncertain such as how a new drug works, what causes cancer and other diseases, and how long a person with a certain illness is likely to survive.

well say a good goal is to do 150 sit ups in a week! or 90 pull ups a day. even 60 push ups in a month these are all fair goals!