ACFT Plank: How to Hold 4 Minutes Without Shaking

The ACFT plank is a strength test disguised as a hold. 4:20 earns 100 points. Most soldiers bail around 2:00 not because their core gives out — because their shoulders and breathing do.

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Why Planks Fail Early

The plank is the most mismanaged event on the ACFT. Three reasons soldiers bail:

• Shoulder fatigue: Elbows unsupported, deltoids take over. Train shoulder endurance separately.
• Hip sag: The judge will stop the count if your hips drop. Anti-extension core is what keeps you flat.
• Breathing: Holding your breath at 90 seconds spikes cortisol and forces you to quit. Breathe slow and low.

The 6-Week Plank Plan

Daily core work + 2 dedicated plank sessions per week.

Weeks 1-2 (Foundation):

• Daily: 3x :60 strict plank, 90s rest
• Monday/Thursday: Hollow body holds 3x :45 + side planks 3x :30 per side

Weeks 3-4 (Loading):

• Monday: Weighted plank 3x :45 with 10-15 lb on back
• Thursday: Max plank test — one all-out effort, log the time
• Other days: Hanging leg raises, farmer carries

Weeks 5-6 (Peak):

• Monday: 3x :90 weighted planks @ 20-25 lb
• Thursday: 2x max-effort plank tests, 5 min apart
• Target: hold :45 longer than last week's max

Form Checklist

• Elbows directly under shoulders — not forward, not back
• Butt squeezed tight — this engages the glutes and keeps hips from sagging
• Abs pulled in — like you're about to take a punch
• Gaze at the floor 2-3 feet ahead — not straight down, not up (protects the neck)
• Heels driving back — extends the spine and tightens the posterior chain

Breathing Strategy

Slow nose-in, mouth-out breathing. 4 count in, 6 count out. Keep the breath low in the belly — not high in the chest. High-chest breathing spikes tension and kills your hold.

Pro tip: count breaths, not seconds. 30 breaths at 6-second exhale = 3 minutes. Much easier to manage mentally.

Accessory Drills That Help

• Hollow body hold: The inverse of a plank. Trains the same anti-extension core.
• Dead bugs: 3x10 per side. Teaches bracing under movement.
• Hanging knee raises: Builds the deep hip flexors the plank recruits at minute 3+.
• Farmer carries: Trains the full trunk stability system under load.

Calculate your ACFT score including plank time →

Test-Day Target

If you can hold 3:30 in training, expect 3:45-4:00 on test day with adrenaline. If you're under 2:00 in training, you need this plan for 6 weeks minimum before trusting the event on your record.