obliques

• 

  90-degree crunch on bench

• 

  Long arm crunch

• 

  Dead bug (with no arm movement)

• 

  Arm-raise push-up

• 

  Seated alternating knee tuck

• 

  One-leg V-up

• 

  Zercher carry

• 

  Seated cross scissor kick

• 

  Roman chair sit-up on a flat bench

• 

  Roman chair sit-up

• 

  Stability ball front plank

• 

  Suspended pike