THE BMI HORROR (ID)

In Gym class we the students, the kids that eat anything we want, the kids that actually don't care about such things surrounded by healthy eating and fitness are learning about Body Mass Index aka BMI. Gym for us use to be fun but now its a pain. We are driven to go back to our past and and dig up or knowledge on long division and forced to not use calculators, specifically problems that take forever to do without an actual calculator. I find it funny how Gym was a subject and class that people found to be easy to pass and hard to fail based on the fact that all you had to do was to get dressed and participate in activities just to pass. Now during our senior year its a class we look at that seems almost impossible to past and just a class that as we say "doing way toooo much." 

Why is it now that we are being taught something during this subject? Why can't it be like the old fun days that we remember? I just want to know because the way this class has my grade looking makes me hurt. 

Not physically though.