Library / Abdominals
Crunch (straight Leg Up)
Bodyweight · Core · Isolation
Abdominals Hip Flexors Joint friendly
Default prescription & biomechanics
- Primary muscles
- Abdominals
- Secondary muscles
- Hip Flexors
- Equipment
- Bodyweight
- Movement pattern
- Core (Pull force)
- Difficulty
- Beginner
- Working rep range
- 15-20 reps per set
- Between-set interval
- 60 seconds rest
Step-by-step coaching cues
- Lie on the floor with your legs fully extended upward
- Position your arms stretched upward
- Flex your torso by contracting your abdomen and move your hands toward your feet
- Return your torso to the floor in a controlled manner
Joint & safety considerations
No specific joint contraindications are flagged for Crunch (straight Leg Up). Maintain controlled tempo across the full range of motion and stop the set if sharp joint pain occurs.
Biomechanical alternatives & swaps
Used by the in-app Swap sheet when your equipment is occupied or when adjusting exercise difficulty.
| Exercise | Relationship | Equipment |
|---|---|---|
| Cable Seated Crunch | Cable swap | Cable |
| Cable Standing Crunch with Rope Attachment | Cable swap | Cable |
| Dumbbell Overhead Sit Up | Dumbbell swap | Dumbbell |
| Dumbbell Plank Pass Through | Dumbbell swap | Dumbbell |
| Kettlebell Plank Pass Through | Kettlebell swap | Kettlebell |
| Lever Seated Crunch | Machine swap | Machine |
From the WorkoutCard biomechanical library (613 verified movements). For general strength and conditioning education, not medical or physiotherapy advice.