Exercise guide
5 Sec Fist Against Chin
- Intermediate
- Isolation
- Rep-based
- Back
- Chest
- Shoulders
- Upper arms
- Waist
This isometric exercise targets the anterior neck flexors to improve cervical stability and posture by resisting downward force without movement.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Sit or stand tall with your shoulders back and down.
- Place one fist directly under your chin, centered against the jawline.
- Ensure your head is in a neutral position, looking straight ahead.
How to do it
- Exhale and gently press your chin down into your fist while resisting with equal force from your hand to prevent any movement.
- Maintain this isometric contraction for 5 seconds while keeping your breathing steady and shallow.
- Inhale as you slowly release the tension and return to a relaxed neutral position.
Form checklist
- Keep your shoulders relaxed; do not shrug them toward your ears.
- Ensure the head remains stationary throughout the hold.
- Keep your jaw relaxed and teeth slightly apart to avoid clenching.
- Apply pressure gradually to avoid sudden strain on the neck.
Pro tips
- Focus on a slight 'chin tuck' before applying pressure to engage the deep cervical flexors rather than just the superficial muscles.
- Visualize lengthening the back of your neck toward the ceiling during the contraction to maintain spinal alignment.
Make it harder
- Increase the hold duration to 10-15 seconds per repetition.
- Apply maximum manual resistance with your fist while maintaining perfect head alignment.
Frequently asked
- What muscles does the 5 sec fist against chin work?
- The 5 sec fist against chin primarily targets the neck, and also works the biceps, deltoids, forearms, grip muscles, and trapezius as secondary muscles.
- What equipment do you need for the 5 sec fist against chin?
- The 5 sec fist against chin requires no equipment — just your body weight.
- Is the 5 sec fist against chin good for beginners?
- The 5 sec fist against chin is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.
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