What is a skill you had but lost?

all the math stuff you learn in school but never really use in real life. I was really good at math as well, and it was one of my favourite subjects... yet, poof, nearly all gone
 
Snowboarding. I miss it but I just no longer have the time and haven't been in like 6 years. I bet I would bust my ass if I got on one right now.
 
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