⭐ 4.9/5 from 58 verified Australian gym owners and athletes
The 20kg Heavy-Duty Slam Ball from 24/7 Gym Equipment is Australia's go-to dead ball for CrossFit RX, Strongman conditioning, and elite posterior chain training. Built with a vulcanised non-slip PVC shell and iron sand fill, this slam ball delivers maximum force absorption — zero bounce, zero roll, zero wasted energy. Every rep is all you.
🛒 Add to Cart — In Stock, Ships from Sydney View Full Slam Ball Range →
- ✅ In Stock — Ships within 1–2 business days
- 🚚 Australia-wide delivery — Tracked from our Sydney warehouse
- 🏋️ Used in commercial CrossFit boxes across Melbourne, Brisbane, Perth & Sydney
- 🔒 Secure checkout — Afterpay & ZIP available
Why This Is Australia's Best 20kg Slam Ball
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Zero-Bounce "Dead Ball" Performance: Premium anti-clumping iron sand fill absorbs 100% of kinetic energy on impact. No bouncing. No rolling. This forces full-body reset between every rep — the same recruitment pattern as Atlas Stone and odd-object Strongman lifting.
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Commercial-Grade Vulcanised PVC Shell: Extra-thick, non-slip PVC tested under repeated high-velocity impact from elite power athletes. It won't split, leak, or flatten under load — whether you're running "Diane," max-effort floor slams, or over-the-shoulder throws.
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Ultra-Grip Tyre-Tread Texture: Deep surface texturing ensures a locked, secure grip in high-sweat, high-volume conditioning sessions. No chalk required.
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Floor-Protecting Exterior: Rubberised casing safeguards gym tiles and timber flooring from high-impact drops — essential for commercial box owners and premium home gym setups.
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CrossFit RX & Strongman Standard Weight: 20kg is the recognised "heavy" standard for competitive CrossFit RX and Strongman conditioning — giving you a training tool that directly mirrors competition demands.
Expert Coaching Tip: Use the 20kg slam ball for over-the-shoulder throws to replicate Atlas Stone mechanics — one of the most effective accessory movements for Strongman competitors and rugby forwards. Programming 4–6 sets of 6–8 reps twice per week will build unmatched functional power through the posterior chain and grip.
Technical Specifications
| Specification |
Detail |
| Weight |
20kg (Fixed) |
| Diameter |
28cm |
| Shell Material |
Heavy-Duty Vulcanised Non-Slip PVC |
| Fill Type |
Premium Anti-Clumping Iron Sand |
| Bounce Profile |
Zero-Bounce (Dead Ball) |
| Surface Finish |
Ultra-Grip Tyre-Tread Texture |
| Recommended Surfaces |
Rubber gym mats, turf, grass |
| Suitable For |
CrossFit RX, Strongman, Functional Training, HIIT |
| Recommended User Level |
Advanced (Deadlift base > 100kg) |
| Shipping Origin |
Sydney, Australia |
| Warranty |
12 Months — Commercial & Home Use |
What Can You Do With a 20kg Slam Ball?
The 20kg slam ball is one of the most versatile conditioning tools in functional fitness. Here are the primary training applications:
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Ground Slams: The classic movement. Hinge, load, and drive the ball overhead before slamming it into the ground. Targets lats, glutes, hamstrings, and core simultaneously.
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Over-the-Shoulder Throws: Simulate Atlas Stone mechanics. Load, clean, and rotate the ball over alternate shoulders. Essential Strongman accessory work.
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Bear Hug Carries: Squeeze the ball against your chest and walk or lunge. Brutal for grip strength, core stability, and anterior chain conditioning.
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Rotational Side Slams: Drive the ball diagonally into the ground to train anti-rotation power — critical for rugby, MMA, and combat sports athletes.
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Wall Throws (power output): Against a reinforced wall, load and throw to train explosive hip extension. Not to be confused with a wall ball — this is raw power development.
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Deadball Cleans: Mimic heavy odd-object cleans from the floor. Develops the pulling mechanics needed for Strongman competition.
Muscles Worked by the 20kg Slam Ball
Slam ball exercises recruit the full posterior chain — glutes, hamstrings, erectors, and lats — as primary movers. Supporting muscles include the core stabilisers (obliques, transverse abdominis), grip and forearm flexors, and shoulder complex (deltoids, rotator cuff). At 20kg, the cardiovascular demand is significant, making it an effective conditioning tool for metabolic conditioning (MetCon) sessions.
Who Is the 20kg Slam Ball Designed For?
- ✅ CrossFit athletes training at RX or competition level
- ✅ Strongman competitors developing Atlas Stone and odd-object strength
- ✅ Rugby forwards, AFL players, and combat sports athletes building functional explosive power
- ✅ Commercial CrossFit box owners equipping their facility with durable, high-use conditioning tools
- ✅ Advanced home gym athletes with an established strength base (deadlift above 100kg)
- ❌ Not recommended for beginners — consider our 12kg Slam Ball or 8kg Slam Ball to start
Frequently Asked Questions — 20kg Slam Ball
Is 20kg the right weight for me?
The 20kg slam ball is suited to advanced athletes with an established strength base — typically a deadlift above 100kg and solid familiarity with hip-hinge movements. If you're newer to slam ball training, start with our 8kg or 12kg options and progress from there.
How heavy is 20kg compared to other slam ball weights?
20kg is the heaviest standard weight in most slam ball ranges and sits at the top end of what CrossFit RX and Strongman programming calls for. For context: 8kg–12kg suits beginners and intermediate athletes, 14kg–16kg suits intermediate-to-advanced, and 20kg is reserved for experienced power athletes targeting maximum conditioning output.
What is the difference between a 20kg slam ball and a 20kg medicine ball?
A 20kg slam ball is a dead ball — filled with iron sand, it absorbs all impact and does not bounce. A medicine ball of the same weight is typically made with a rubber shell and will bounce unpredictably when slammed. The 20kg slam ball is specifically engineered for high-force floor slams, over-the-shoulder throws, and loaded carries. Never use a standard medicine ball for slam training at this weight.
What is the difference between a slam ball and a wall ball?
A slam ball is a dead ball designed to be thrown hard at the floor with zero rebound — forcing maximum effort on every rep. A wall ball is larger, softer, and designed to bounce off a wall for high-rep cardio movements like thrusters. They are not interchangeable. A 20kg wall ball does not exist for good reason — wall balls top out at around 9kg–10kg by design.
How many reps and sets should I do with a 20kg slam ball?
For power development, programme 4–6 sets of 4–6 reps with full reset between each rep. For metabolic conditioning, use timed sets of 20–30 seconds with 30–40 seconds rest. At 20kg, quality of movement matters more than volume — avoid grinding through fatigued reps with compromised form, particularly on overhead slam movements.
Can I use the 20kg slam ball on concrete surfaces?
The vulcanised PVC shell is highly durable, but concrete is abrasive and will accelerate surface wear over time. For maximum product life, use your 20kg slam ball on rubber gym mats, turf, or grass. At this weight, the impact force is significant — rubber matting also protects your flooring and reduces noise in commercial settings.
Why is the 20kg slam ball filled with iron sand and not rubber or gel?
Iron sand is significantly denser than rubber granules or gel, which means the ball achieves its 20kg weight in a compact 28cm diameter. This gives the ball a true dead-weight feel with a shifting load that challenges grip and core stability on every movement. Gel or rubber-filled balls at this weight would be unwieldy in size and wouldn't replicate the odd-object feel that makes slam ball training so effective.
Is a 20kg slam ball good for CrossFit?
Yes — 20kg is the recognised RX standard for slam ball movements in competitive CrossFit. It appears in workouts requiring ground slams, over-the-shoulder throws, and deadball cleans. If you're preparing for CrossFit competition or training RX consistently, the 20kg is the weight you need to be training with.
Does 24/7 Gym Equipment ship the 20kg slam ball Australia-wide?
Yes. We ship from our Sydney warehouse to all major cities and regional areas across Australia — Melbourne, Brisbane, Perth, Adelaide, Canberra, Darwin, and beyond. All orders are fully tracked. Due to its weight, freight surcharges may apply for remote postcodes and will be calculated at checkout.
Order Your 20kg Slam Ball — Fast Delivery Across Australia
Whether you're running a commercial CrossFit box in Melbourne, equipping a strength facility in Brisbane, or building a serious garage gym in Perth — 24/7 Gym Equipment delivers Australia's most durable slam balls, fast and fully tracked from our Sydney warehouse.
🛒 Add 20kg Slam Ball to Cart
Not ready for 20kg? Browse our full slam ball range — available from 8kg to 20kg. Need help choosing? Contact our team — we're real athletes who know this gear.
