Tricks to get baby to move

Brittney🌸 • Mama to Vanessa & Wyatt
What sort of things do you do to make baby more active? I am going in for my elective ultrasound to determine gender on Sunday and I want to make sure baby moves a lot so we get a good shot ☺️ I will be 17+1 and I am 16+4 right now I can already feel baby moving! 
Right now I'm just laying down and poking my tummy and sometimes that makes baby move but it's still sporadic. I've heard cold water helps -- anything else?