How Can I Train My Abs Without Doing Crunches?

Squat

Dead Lift

Lunge

Step Up

Clean

Snatch

Turkish Get Up

Shoulder Press

Push Up

Pull Up

Row

Abdominal Hollowing

Lower Abdominal #1-#4

Plank

Side Bridge

Upper/Lower Body Russian Twist

Supine Lateral Ball Roll

Supine Hip Extension

Supine Hip Extension Knee Flexion

Swim, Bike, or Run

Good Ole Belly Laugh

Daily Bowel Movement

Simply Stand Up

Breathe Properly

Etc.