Related Clues:
- Keystone Cops' initial material, worth mining
- A spare tire hides them
- Six-pack parts
- Reverse crunches work them
- Planking muscles
- Muscles targeted by bicycle crunches
- Earth's is made of iron and nickel
- What some gym reps work
- 78 Across muscles
- Pineapple discard
- Muscles used while doing deadbugs
- Abs are part of it
- Target of planks
- Plank jacks work them
- Muscles worked by flutter kicks