Few movements feel as primal or as productive as swinging a heavy hammer against a giant tire.
The sledgehammer strike blends rotational force, grip strength, cardio conditioning, and mental focus into one violent but controlled movement. It’s as close to old-school hard labour as you’ll get in the gym, and that’s exactly why it’s one of our top RB100 challenges.
In Challenge #90, you’ll complete 100 full-power strikes, alternating sides and maintaining form throughout.
“Grip it. Rip it. Reset. There’s nothing more honest than a hammer strike.”
– RB100.Fitness
Challenge Rules
- Reps: 100 total
- Equipment: Sledgehammer (6–12kg) and a large tractor tire
- Form Guidelines:
- Use rotational swing from shoulder to hip
- Alternate sides every 5–10 strikes
- Hit centre of tire with full control
- Maintain posture and core stability
Suggested Set Options
- 10 × 10 with short rest
- 5 × 20 alternating every 5 reps
- EMOM: 10 strikes per minute for 10 minutes
- Max effort: 100 for time (track it in the RB100 Tracker)
Why It Works
Sledgehammer training is a rotational power developer that mimics real-world movement mechanics — chopping, swinging, striking — while building the kind of functional strength few isolation lifts ever touch.
Muscles Worked:
- Forearms and grip
- Core and obliques
- Shoulders and traps
- Glutes and hips (through rotation and stance)
It’s also a brilliant stress relief tool, giving you a satisfying outlet that doubles as power cardio.
Technique Tips
- Lead with hips and shoulders, not just arms
- Keep your eye on the tire – don’t swing blind
- Pivot back foot slightly to allow rotation
- Reset grip between sets to avoid slipping
- Breathe rhythmically: inhale on pull-back, exhale on strike
Scaling & Progressions
- Beginner: Use a lighter hammer (4-6kg) and take longer rest
- Intermediate: Standard 6-8kg hammer, alternating sides
- Advanced: 10kg+ hammer, unbroken reps, minimal rest
- Add footwork for athleticism or combine with battle rope rounds
- Pair with #64: 100 Battle Rope Slams for a total upper-body finisher
Programming Ideas
This works well as:
- Finisher after strength days
- Warm-up for rotational sports (e.g. rugby, MMA)
- Recovery tool when done light and rhythmic
- Partner challenge: 50 reps each for time
Recovery & Mobility
Expect fatigue in grip, traps, and abs. Recover with:
- Wrist mobility drills
- T-spine rotations
- Forearm release with ball or band
- Hydrate as always via #23: 100oz Water Daily
Learn More
- Kettlebell Kings: Sledgehammer Conditioning Workouts
- Kettlebell Kings: Why Every Athlete Should Train with a Hammer
