The most common cause is depression.
I hope this hellps you.
Physical education is what is known as instruction in physical exercise, and or games, as for schools especially .
It is true. if you feel sad, you wont want to go on a run. if you feel happy, youll be more than happy to. it does make a difference. if you dont like soccer, you wouldnt play it. if you had a bad expiernce with golf (somehow xD) you most likely wouldnt feel up to playing it.