Crunches: A Simple and Effective Abdominal Workout

What is the primary muscle group targeted by crunches?

• Back muscles

• Leg muscles

• Abdominal muscles

• Arm muscles

What is the recommended starting routine for beginners doing crunches?

• Five sets of 20 repetitions

• Four sets of 12 repetitions

• Two sets of 15 repetitions

• Three sets of 10 repetitions

In a reverse crunch, which part of the body is primarily moved?

• Arms

• Lower body

• Upper body

• Neck

What equipment can be used to add instability and work a wider range of abdominal muscles during crunches?

• Treadmill

• Resistance bands

• Dumbbells

• Balance ball

Which crunch variation involves twisting the upper body to meet alternate elbows with opposite thighs?

• Basic crunch

• Reverse crunch

• Side crunch

• Twist crunch