Related Clues:
- Core features?
- Plank muscles
- Pilates roll up targets
- Muscles worked by dead bugs
- Muscles worked by pull-downs, for short
- Muscles worked by bicycle crunches
- Back muscles, to trainers
- Core muscles worked by crunches
- Muscles worked by laughter, briefly
- Muscles worked while planking
- V-up muscles
- Parts of six-packs
- They're used in a crunch!
- Muscles that mountain climbers work
- They're under spare tires