To work out how much they are paid per hour, and how much to charge clients. Also, how long it will take to get from one client to the next, when travelling to appointments. Possibly could use maths to calculate "rate of improvement" in each client's fitness - i.e how many reps could they do last time minus how many reps could they do this time, divided by time between sessions, (modularised, clearly, otherwise a negative value will probably result).
Chat with our AI personalities
If your talking maths, it would be a protracter.
For the same reasons that we need to use maths today.
The same reason that people of other countries use maths.
good maths =)
Everywhere everyday you use maths for