Kettlebell Skull Crusher exercise demonstration image

Video Coming Soon

We're working on adding video demonstrations for this exercise.

Kettlebell Skull Crusher

Intermediate
Home Friendly

Lying triceps extension using a kettlebell that targets the triceps brachii for strength and hypertrophy; performed on the floor or bench with controlled elbow flexion.

About Exercise

Equipment

Kettlebell, Flat Bench

Difficulty

2/5 • Intermediate

Primary Muscle Groups

Triceps

Secondary Muscles

Forearms, Shoulders

Accessory Muscles

Abs, Lower Back

Popularity Score

5

Goals

Strength
Hypertrophy

Training Style

Bodybuilding
Weightlifting

Setup Requirements

Requires Rack

No

Requires Bench

No

Requires Spotter

No

Space Needed

Small

Noise Level

Low

Muscle Breakdown

Triceps

10/10

Long Head, Lateral Head, Medial Head

Forearms

5/10

Flexors

Shoulders

3/10

Anterior Delts

Abs

2/10

Rectus Abdominis

Lower Back

2/10

Erector Spinae

Programming

Typical Rep Range

8-15 reps

Rest Between Sets

60-90 seconds

How to Perform

Lie on your back on the floor or a flat bench with knees bent and feet flat. Hold a kettlebell with both hands by the horns and press it straight overhead above your shoulders.

  1. Keep upper arms stationary and perpendicular to the floor.
  2. Bend only at your elbows to slowly lower the kettlebell toward your forehead.
  3. Pause briefly at the bottom with elbows bent.
  4. Contract your triceps to extend your arms and return the kettlebell to the starting position.
  5. Avoid locking elbows at the top.
  6. Repeat for desired reps while maintaining control.

Coaching Tips

Form Cues

  • Upper arms fixed
  • Elbows tucked in
  • Control the descent
  • Squeeze triceps hard
  • Core braced tight

Breathing

Inhale as you lower the kettlebell, exhale as you extend your arms, and brace your core throughout.

Tempo

3-1-1

Range of Motion

Lower until forearms are parallel to the floor and elbows at 90 degrees; extend until arms are straight without hyperextending elbows.

Safety

Safety Notes

  • Start with light weight to master form
  • Avoid if acute elbow pain exists
  • Keep elbows narrow to protect shoulders
  • Engage core to prevent spinal arching
  • Use firm grip to prevent slipping
  • Discontinue if joint discomfort occurs

Spotting

For heavy loads, have a spotter assist by supporting the elbows from above; otherwise, use safeties or perform on floor for natural stop.

Common Mistakes

  • Flaring elbows outward
  • Arching lower back
  • Dropping weight too fast
  • Allowing upper arms to drift
  • Incomplete range of motion

When to Avoid

  • Acute elbow pain or tendinitis
  • Shoulder impingement
  • Recent elbow or shoulder injury

Flexibility Needed

  • Adequate shoulder flexion to hold arms overhead
  • Wrist mobility for kettlebell grip

Build Up First

  • Basic understanding of elbow extension
  • Grip strength for kettlebell handle
  • Core stability to maintain spinal alignment

Also known as

Kettlebell Lying Triceps Extension, KB Skull Crusher, Kettlebell Triceps Extension

Found this helpful?

Share your thoughts or help us improve this guide.

Hero Image

Master your movement.

Experience automatic exercise detection and rep counting - powered by the motion of your Apple Watch.

We use cookies to enhance your browsing experience, serve personalized content, and analyze our traffic. By clicking 'Accept All', you consent to our use of cookies.