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Exercise guide

Hundred

  • Intermediate
  • Compound
  • Timed hold
  • Waist

A foundational Pilates exercise that builds exceptional core endurance and stability by combining isometric abdominal contraction with rhythmic breathing and arm movement.

Reviewed by the Crucible team · Updated June 2026

Watch the Hundred demonstrationGuided video and your full workout live in the Crucible app.

Muscles worked

Primary

  • Abs
  • Obliques

Secondary

  • Serratus anterior

Equipment

  • Body weight

Setup

  1. Lie flat on your back on a mat with your legs extended and arms by your sides.
  2. Lift your legs to a 45-degree angle, squeezing your inner thighs and quadriceps together tightly.
  3. Curl your head, neck, and shoulders off the mat, gazing toward your belly button to engage the upper abs.
  4. Hover your arms 2-3 inches off the floor, reaching long toward your feet with palms facing down.

How to do it

  1. Begin pulsing your arms up and down vigorously with a small range of motion, keeping them straight and rigid.
  2. Inhale deeply through your nose for 5 counts as you pump your arms.
  3. Exhale forcefully through pursed lips for 5 counts as you continue pumping.
  4. Repeat this cycle 10 times to reach a total of 100 pumps, maintaining a steady, rhythmic tempo throughout.

Form checklist

  • Keep your lower back pressed firmly into the mat to protect the spine.
  • Maintain a 'scooped' abdominal position, pulling your navel toward your spine.
  • Keep your shoulder blades lifted off the floor and your chin slightly tucked.
  • Ensure the arm movement comes from the shoulders, not the wrists or elbows.

Pro tips

  • Imagine you are slapping water with your palms to create resistance and engage the lats and serratus.
  • Focus on the 'hollow body' position; the lower your legs go, the harder your lower abs must work to stabilize the pelvis.

Make it harder

  • Lower your legs until they are just hovering a few inches above the floor while maintaining a flat lower back.
  • Perform the exercise while holding very light weights (1-2 lbs) to increase the challenge on the shoulders and core.

Frequently asked

What muscles does the hundred work?
The hundred primarily targets the abs and obliques, and also works the serratus anterior as secondary muscles.
What equipment do you need for the hundred?
The hundred requires no equipment — just your body weight.
Is the hundred good for beginners?
The hundred is rated intermediate. Build a base with simpler variations first, then progress to it with light load and strict form.

Related exercises

  • 3/4 Sit-UpBeginner · abs and obliques
  • 45 Degree Bicycle Twisting CrunchIntermediate · abs and obliques
  • 45 Degree Lean Back Alternate Knee RaiseBeginner · abs and obliques
  • 45 Degrees Arms PlankIntermediate · abs, deltoids, obliques, and pectorals

Train this with a plan, not guesswork

Crucible builds the hundred into a precise program around your body, equipment, location, and time.

Download on the App Store