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

Other days

self appreciation

Self Appreciation Day
african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
buddy

Buddy Day
ormille

Ormille Day
unicorn

Unicorn Day
self care

Self Care Day
eat what you want

Eat What You Want Day
special education

Special Education Day
boyfriend

Boyfriend Day
polyamory

Polyamory Day