#2: Perform a 100-Second Plank

Perform a 100-Second Plank

The plank: one of the most underrated tests of strength, endurance, and mental focus in fitness. The 100-second plank challenge may sound simple — until you’re 60 seconds in and fighting to keep your core stable, shoulders set, and mind calm.

“Stillness under pressure is the real test of strength.”
— RB100.Fitness

This challenge trains your ability to hold perfect form under tension — without moving, without rushing, and without distraction.

Why the 100-Second Mark?

• It’s long enough to expose weakness — short enough to remain achievable
• A step beyond the classic 60-second hold
• Forces you to engage and breathe consistently
• Provides a clear benchmark for functional core strength

Technique Cues

• Forearms on ground, elbows under shoulders
• Body in straight line from head to heels
• Squeeze glutes, quads, and abs
• Avoid hip sag or hiking — quality matters

How to Build Up

• Start with shorter holds (3x30s) with full focus on form
• Add 5–10 seconds each session
• Mix in side planks and hollow holds to complement training

Challenge Add-Ons

• Time yourself weekly and track improvement
• Combine with #1: 100 Push-Ups a Day for a bulletproof upper body circuit
• Finish with mobility from #28: 100 Minutes of Weekly Mobility

Variations

• Advanced: Weighted plank (plate on back)
• Dynamic: 10s forearm → 10s high plank x5
• Partner: Countdown timer, compete for form and control

Coaching Tips

• Don’t hold your breath — stay calm and focused
• Film yourself once a week to check alignment
• Use music or mantras to stay present during the burn

External References:

• WellbeingMagazine.com: Why Core Stability Matters
• PersonalTrainerTunbridgeWells.co.uk: Core Strength Basics

Close-up of abs and shoulders during a plank hold Countdown timer showing 1-40 during plank exercise