Oops, it doesn't look like 'workout day' is a national day..

Other days

my little pony

My Little Pony Day
gum

Gum Day
gallery

Gallery Day
ormille

Ormille Day
hoodie

Hoodie Day
kale

Kale Day
nae nae

Nae Nae Day
stress awareness

Stress Awareness Day
bubble bath

Bubble Bath Day
blanket fort

Blanket Fort Day