BOY OH BOY

i spent 2 periods with one class and came out still feeling refreshed

but 1 period with a class of 9 boys left me so exhausted and totally drained... i can't put my finger to it...it's not like they have a bad attitude, or are irritating in any way...they are a lovely bunch of fellows...but i left the class feeling like i had been mauled...

somebody please explain...