RKC Plank

CoreBW

A maximal-tension plank variant popularized by StrongFirst/RKC. Instead of just holding position, you actively co-contract glutes, quads, lats, and abs to create irradiated total-body tension, making the hold dramatically harder in a much shorter time.

Demo: StrongFirst-style demo

Sets

4

Reps

10-20 sec max tension hold

Rest

45s

Contraindications

None significant; regress duration if shaking indicates technique breakdown, not just fatigue.

Setup

Standard forearm plank position, elbows under shoulders, feet close together.

Execution

  1. 1Clench fists and forearms hard into the floor
  2. 2Pull elbows toward toes and toes toward elbows without moving
  3. 3Squeeze glutes and quads maximally, adduct the legs
  4. 4Posteriorly tilt the pelvis slightly
  5. 5Hold 10-20 seconds at max tension, then rest

Key cues

  • Irradiate — squeeze everything at once
  • Pull your toes to your elbows isometrically
  • Rip the floor apart with your forearms
  • Short and brutal, not long and loose

Common faults

  • Treating it like a regular long-duration plank (low tension)
  • Losing the posterior pelvic tilt under fatigue
  • Holding breath entirely instead of controlled hissing exhales
  • Flaring elbows out losing lat engagement

Tweaks

  • Add hip abduction against a mini band
  • Elevate feet on a box for more anterior core load
  • Pair with hollow hold for a superset

Regressions

Front Plank

Progressions

Long-Lever PlankForearm Plank with Shoulder Taps

Muscles

Primary: Rectus Abdominis, Transverse Abdominis, Glutes

Secondary: Lats, Quads, Erector Spinae

Notes

ANTI-EXTENSION. Named for the RKC kettlebell certification; teaches maximal irradiated tension that carries over to heavy compound lifts.

Sources

Attribution: StrongFirst / RKC (Russian Kettlebell Certification)