i didnt know i had robust curls until like 13 yo when my moms bestie once said "hold up.." after walked in the room just having washed my hair - then instructed me bend over (so my hair was upside down) and introduced me to scrunching in leave-in conditioner

before thus i just brushed in v wrong product in my hair as if i had straight hair - resulted in either very oily or very frizzy situations 

 That works for me, for about a day. Then I get some waves. But I like it wear it in a ponytail for hikes and then it's a frizzy mess.