@justcellus: Most people can’t finish this one…can you?! This is the IRON CORE 400 CHALLENGE FYI…you will be sore. 4 moves and 400 reps of complete core carnage 🔥 The Challenge: 100 Alternating Single Leg Raises 100 Crunches 100 Knee Tucks 100 Plank Knee to Elbow Goal: Complete all 400 reps as fast as possible without sacrificing form 🏆 Tier Rankings: <8 min = IRON GOD 8-11 min = IRON ELITE 11-15 min = IRON GRIT 15+ min = IRON STARTER 📌 Save for your next workout 💬 Comment your time + tier 👥 Send to a friend you know you can beat #ironrank #fitnesschallenge #corechallenge #core #viralchallenge

Marcellus

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Wednesday 12 August 2026 21:29:56 GMT