If you want to try Ting and Reif's workouts, this lower ab workout with 18 million views is Pamela Reif's creation, and this Chloe Ting ab workout has over 420 million views.

I tried the 10-minute Pamela Reif killer-abs workout — here’s what happened Reif wasn’t lying when she said this workout was advanced — a few exercises in and my core was shaking.