Balance Trainer Crunch
The Balance Trainer Crunch is a core exercise performed on a BOSU ball that targets the upper abdominals while engaging stabilizer muscles. By performing crunches on an unstable surface, this movement increases the range of motion and activation compared to a standard floor crunch.
Iridium checks your 7-day workout history to ensure your core isn't pre-fatigued from heavy compound lifts before scheduling this stability-focused exercise. To manage progressive overload, the system tracks your RPE and rep counts relative to your current body weight rather than external load. If your upper abs haven't recovered according to your specific volume landmarks, Iridium will substitute this for a less demanding movement or remove it entirely.
Form Cues
- Position your lower back comfortably on the curve of the dome
- Keep your feet flat on the floor and hip-width apart
- Exhale forcefully as you curl your ribcage toward your hips
- Extend back over the dome to get a full abdominal stretch
- Tuck your chin slightly to protect your neck
- Don't pull on your head or neck with your hands
- Don't lift your hips or glutes off the dome
- Don't use momentum to bounce out of the bottom position
- Don't hold your breath during the contraction
Common Mistakes
- Pulling excessively on the neck
- Bouncing to generate momentum
- Limiting range of motion
- Lifting hips off the ball
- Holding breath while crunching
Muscles Worked
This exercise primarily targets the rectus abdominis, allowing for a greater stretch and contraction range than floor variations. The unstable nature of the balance trainer also heavily recruits the transverse abdominis and internal obliques to stabilize the torso throughout the movement.
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Secondary
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