If you want to do crunches as part of your workout routine, stick to a moderate number as you would with any other exercise — three sets of 10 to 12 reps is generally sufficient. Vary your crunches by doing bicycle crunches, reverse crunches and oblique crunches to hit multiple muscles.
How many double crunches should I do?
If you want to do crunches as part of your workout routine, stick to a moderate number as you would with any other exercise — three sets of 10 to 12 reps is generally sufficient. Vary your crunches by doing bicycle crunches, reverse crunches and oblique crunches to hit multiple muscles.