Related Clues:
- Muscles worked by Russian twists
- Muscles that are targets of planking, informally
- Ones feeling the crunch?
- Stabilizing muscles
- What your core covers
- Focus for a core workout
- Fitness centers?
- Muscles worked by side planks
- Watches' gears and springs, e.g
- Core muscles, in brief
- "Six-pack"
- Muscles that get 'crunched' in crunches
- Auto safety feature preventing skidding, for short
- Flutter kicks work them
- Targets of sit-ups