Stop it. You're just asking for trouble. Here's why.
Situps Vs. Crunches: Which Is Better For Strong Abs, Per Trainers
Premium Vector Strong Hand Holding Dumbbell
11 Effective Twist Exercises For Your Abs
Tip: The Athlete's Floor Press
Get Twisted With These 6 Yoga Poses - YogaUOnline
Yoga twists, the ins and outs - Ekhart Yoga
Sit Ups With Twist by Gracie D. - Exercise How-to - Skimble
The McGill Big 3 For Core Stability – Squat University
12 Bench Ab Exercises to Train Your Core (Plus a Workout)