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Exercise guide

Training Level

  • Intermediate
  • Compound
  • Timed hold
  • Back
  • Lower legs
  • Shoulders
  • Upper legs
  • Waist

The Forearm Plank (Training Level) is a foundational isometric core exercise that builds total-body stability and endurance. It forces the core to resist spinal extension while engaging the legs, glutes, and shoulders to maintain a rigid, neutral posture.

Reviewed by the Crucible team · Updated June 2026

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

Muscles worked

Primary

  • Calves
  • Hamstrings

Secondary

  • Erector spinae
  • Serratus anterior

Equipment

  • Body weight

Setup

  1. Lie face down on the floor with your forearms flat, elbows positioned directly underneath your shoulders.
  2. Extend your legs straight back with your feet hip-width apart and toes tucked.
  3. Clasp your hands together or keep your forearms parallel to each other, maintaining a neutral neck by looking at the floor.

How to do it

  1. Exhale as you lift your knees and torso off the ground, creating a straight line from your head to your heels.
  2. Engage your core by pulling your navel toward your spine and squeezing your glutes firmly.
  3. Maintain a steady, shallow breathing pattern while holding the position for the target duration.
  4. Lower your knees back to the floor with control to finish the set.

Form checklist

  • Do not let your hips sag toward the floor or pike them too high in the air.
  • Push actively through your elbows to prevent your shoulder blades from collapsing together.
  • Keep your head in line with your spine; avoid looking up or dropping your chin to your chest.
  • Ensure your weight is distributed evenly between your forearms and toes.

Pro tips

  • To maximize tension, try to 'pull' your elbows toward your toes without actually moving them; this creates an intense abdominal contraction.
  • Focus on a posterior pelvic tilt—tucking your tailbone slightly—to better isolate the lower abs and protect the lumbar spine.

Make it harder

  • Lift one leg slightly off the floor to create instability and increase the demand on your obliques.
  • Walk your elbows 2-3 inches further forward to increase the lever length, making the core work significantly harder.

Frequently asked

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

Related exercises

  • Alternating Child To Downward Dog To Body RockIntermediate · abs, calves, hamstrings, and lats
  • Burpee Over The DumbbellIntermediate · calves, glutes, hamstrings, and quadriceps
  • Burpee ShuffleIntermediate · calves, glutes, hamstrings, and quadriceps
  • Burpee Single Leg JumpIntermediate · calves, glutes, hamstrings, and quadriceps

Train this with a plan, not guesswork

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

Download on the App Store