But NOT this: 
More like this: 
What are your best tips and tricks to add volume? 
I've tried a root-lifting foam, blow-drying with my head flipped upside down, clip-in extensions, and teasing the roots. Usually my hair flattens back out pretty quick, which is weird because I have thick hair. 
I want to play with it this weekend since we're going out for Valentine's Day and I usually don't have the time or patience to bother with my hair. So any advice will be appreciated! TIA!