You’re in the gym section of Argos staring at kettlebells that all look the same except for the colour and the number stamped on the side. Cast iron, competition, vinyl-coated, adjustable — the options feel unnecessarily complicated for what is essentially a cannonball with a handle. But the differences matter more than you’d think. The wrong kettlebell doesn’t just feel awkward — it limits the exercises you can do, wears out faster, and can genuinely hurt you if the handle is the wrong size for your grip or the base is unstable during floor work.
In This Article
- Why Kettlebells Are Worth the Investment
- Cast Iron vs Competition vs Adjustable
- The Best Kettlebells in the UK
- What Weight Kettlebell Should You Start With
- Handle Diameter and Finish
- Kettlebell Exercises Every Beginner Should Learn
- Building a Kettlebell Collection
- Where to Buy Kettlebells in the UK
- Frequently Asked Questions
Why Kettlebells Are Worth the Investment
A single kettlebell replaces a surprisingly large amount of gym equipment. Swings build explosive hip power and cardiovascular fitness. Turkish get-ups build total-body stability. Goblet squats build leg strength. Presses build shoulders. Rows build back. A 16kg kettlebell and 2×2 metres of floor space is a complete home gym for most people — no bench, no barbell, no rack required.
The Cost Argument
A decent 16kg cast iron kettlebell costs about £30-50. Compare that to a gym membership at £30-50 per month. The kettlebell pays for itself in month one and continues delivering for decades. Cast iron doesn’t wear out, break down, or need servicing. It just sits there, waiting for you to pick it up, looking vaguely menacing on the floor of your spare room.
Why They Work Differently From Dumbbells
The weight distribution is the key difference. A dumbbell’s weight is balanced either side of your hand. A kettlebell’s weight hangs below the handle, creating a pulling force that changes throughout each movement. This off-centre loading demands more stabilisation from your core, grip, and shoulders than equivalent dumbbell exercises. The result: more muscles working harder per rep.
Cast Iron vs Competition vs Adjustable
Cast Iron Kettlebells
The traditional choice. A solid lump of cast iron with an integrated handle. As the weight increases, the bell gets bigger — a 32kg cast iron kettlebell is noticeably larger than a 16kg one. This means the handle thickness and distance from the bell body also change between weights, which affects technique consistency.
- Best for: home gyms, general fitness, beginners
- Price: £20-60 depending on weight and brand
- Pros: cheap, durable, widely available
- Cons: size varies by weight (inconsistent feel), some cheap ones have rough handles
Competition Kettlebells
All competition kettlebells are the same external size regardless of weight — a 8kg comp bell is the same dimensions as a 32kg comp bell. The difference is the material inside (hollow shells filled to the target weight with steel shot or cast material). The handle diameter, height, and window size are standardised to international kettlebell sport specifications.
- Best for: serious kettlebell training, sport competitors, anyone who values technique consistency
- Price: £40-100+ per bell
- Pros: same dimensions at every weight (technique transfers perfectly), flat base for racked exercises, professional feel
- Cons: more expensive, single-piece colour coding can look plasticky on cheaper brands
Adjustable Kettlebells
A single unit where you add or remove weight plates to change the load. Brands like Bowflex, JaxJox, and generic selector models offer 4-18kg or 8-32kg ranges in one bell.
- Best for: small spaces where owning multiple kettlebells isn’t practical
- Price: £100-250
- Pros: space-efficient, cost-effective if you’d otherwise buy 5+ bells
- Cons: bulkier than fixed bells, weight changes take 15-30 seconds, mechanism can feel less solid than cast iron, some don’t work well for swings (the plates can shift)
The Best Kettlebells in the UK
Wolverson Fitness Cast Iron — Best Overall
About £30-50 depending on weight. Wolverson is a UK-based brand that’s become the go-to recommendation in British kettlebell communities. The handle finish is smooth but not slippery (a sandblasted texture that grips well with chalk), the flat base is genuinely flat (not all are — cheaper kettlebells wobble), and the casting quality is consistent.
Available direct from Wolverson’s website and through Amazon UK. They’re used by CrossFit boxes and personal trainers across the country — a strong endorsement of durability. The 16kg and 24kg are the most popular sizes.
Decathlon Corength — Best Budget
About £15-35 depending on weight. Decathlon’s own-brand kettlebells are the cheapest worth buying. The vinyl coating protects floors and reduces noise (important in a flat or terraced house), and the handle is reasonably smooth for the price. The flat base is stable enough for renegade rows and other floor-based exercises.
The vinyl coating adds a few millimetres to the bell diameter and makes the grip feel slightly different from bare iron. If you’re serious about kettlebell training, you’ll eventually want to upgrade to uncoated bells — but as a starting point, these are hard to fault for the money.
Bulldog Gear Competition — Best Competition Bell
About £55-80 per bell. Bulldog Gear is another UK brand with a strong reputation in the functional fitness community. Their competition bells are colour-coded to the international standard (yellow 16kg, green 24kg, red 32kg, etc.), have a 33mm handle diameter across all weights, and a genuinely flat base.
The finish is a powder coating that handles chalk well and doesn’t chip easily. If you plan to do kettlebell sport or want the consistency of same-sized bells across your collection, Bulldog Gear is the UK brand to buy.
Bowflex SelectTech 840 — Best Adjustable
About £180. The Bowflex adjusts from 3.5kg to 18kg in 3.5kg increments using a dial selector. The mechanism is solid and quick to change — faster than screw-plate adjustable models. The shape is slightly different from a traditional kettlebell (wider, more rectangular profile) but it works well for most exercises.
The 18kg maximum is a limitation for experienced lifters. If you’re strong enough to swing 18kg comfortably, you’ve outgrown this bell and need fixed kettlebells at higher weights. But for beginners and intermediate users in a small flat, it replaces five separate kettlebells.
Gravity Fitness Competition — Best Value Competition Bell
About £40-55 per bell. A step below Bulldog Gear on finish quality but a step above on value. Gravity Fitness competition bells meet the standard dimensions, have a decent powder-coat finish, and perform well in training. The handle finish is slightly rougher than Bulldog Gear, which some lifters actually prefer for heavy swings (more grip without chalk).
Available from Gravity Fitness direct and Amazon UK. For someone building a competition bell collection on a budget, these are the sweet spot.
What Weight Kettlebell Should You Start With
General Guidelines
- Women new to strength training: 8kg
- Women with gym experience: 12kg
- Men new to strength training: 12kg
- Men with gym experience: 16kg
- Strong/experienced men: 20-24kg
These are starting points for the swing — the foundational kettlebell exercise. For pressing movements (overhead press, Turkish get-up), start lighter than your swing weight. For squats (goblet squat), you can often go heavier.
The Two-Bell Starter Set
Most beginners are best served by two kettlebells: one for swings and squats (heavier) and one for presses and get-ups (lighter). For an average man: 16kg + 12kg. For an average woman: 12kg + 8kg. This two-bell setup covers every foundational exercise without either being too heavy or too light.
Don’t Start Too Light
A kettlebell that’s too light teaches you bad habits — you muscle through movements with your arms instead of using your hips. Swings should be powered by an explosive hip hinge, not an arm lift. A kettlebell that feels “a bit heavy” for swings is usually the right weight — it forces you to use proper technique because your arms literally can’t do the work alone.
Handle Diameter and Finish
Why the Handle Matters
Your grip is the connection point between you and the bell. A handle that’s too thick fatigues your forearms before your target muscles. A handle that’s too thin digs into your fingers. A rough handle tears calluses; a smooth handle slips when wet.
Standard Dimensions
- Cast iron handles: 28-38mm diameter, varies by brand and weight
- Competition handles: 33mm diameter, standardised across all weights
- Women’s competition handles: 33mm (same standard — women’s bells are simply lighter, not smaller-handled)
Finish Options
- Raw/bare iron — the purest grip feel. Works well with chalk. Can rust if stored in damp conditions. Wipe with a light oil (3-in-1 or WD-40) after sweaty sessions.
- Powder coat — the most popular finish on quality bells. Provides consistent grip, resists corrosion, handles chalk well. Chips if you bang bells together aggressively.
- E-coat (electrophoretic coating) — smoother than powder coat, more durable, slightly less grippy. Common on mid-range bells.
- Vinyl/rubber coating — protects floors and reduces noise. Adds thickness to the handle. Fine for casual use but serious kettlebell athletes avoid them because the coating changes the grip feel.
Kettlebell Exercises Every Beginner Should Learn
The Kettlebell Swing
The foundation of all kettlebell training. A hip-hinge movement that builds explosive power in the glutes, hamstrings, and core while developing cardiovascular endurance. Start with sets of 10-15 and build to sets of 20-30.
The most common mistake: squatting the swing instead of hinging. Your knees should bend slightly but the power comes from driving your hips forward, not from squatting up and down. Think of it as a standing plank at the top — glutes squeezed, abs braced, arms straight.
The Goblet Squat
Hold the kettlebell by the horns (sides of the handle) against your chest. Squat to full depth with your elbows tracking inside your knees. This is the best squat variation for learning proper depth and keeping an upright torso. It also builds serious leg and core strength.
The Turkish Get-Up
A slow, deliberate movement from lying flat on the floor to standing upright, with one arm holding a kettlebell overhead throughout. It builds shoulder stability, hip mobility, core strength, and body awareness. It looks strange and feels harder than it looks — which is exactly why it works.
The Kettlebell Press
Press the bell overhead from a racked position (held at shoulder height). Builds shoulder and tricep strength. Keep your wrist straight, elbow close to your body at the start, and press in a slight arc rather than straight up.
The Kettlebell Row
Hinge forward, support yourself with one hand on a bench, and row the kettlebell to your hip. Builds back and bicep strength. Pull with your elbow, not your hand — imagine your hand is just a hook holding the bell.
Building a Kettlebell Collection
The Progression Path
Most people need 3-5 kettlebells to cover their training needs long-term:
- Light (8-12kg) — presses, get-ups, rehabilitation exercises
- Medium (16-20kg) — swings, squats, rows for most people
- Heavy (24-32kg) — heavy swings, squats, and carries as you get stronger
- Very heavy (32kg+) — advanced training, heavy swings, farmer’s carries
You don’t need all of these on day one. Buy your starting weight, train with it for 3-6 months, then add the next weight up when your current bell feels comfortable for high-rep sets.
Cost to Build a Set
A practical four-bell collection (12kg, 16kg, 24kg, 32kg) in cast iron costs about £120-200 total. The same in competition bells costs about £200-350. Spread the purchases over a year and the cost per month is less than most gym memberships.
According to Sport England’s Active Lives Survey, home gym equipment usage increased markedly from 2020 onwards, with kettlebells being one of the most popular home training tools. The trend has stuck — people discovered that effective strength training doesn’t require a commercial gym.
Where to Buy Kettlebells in the UK
Online
- Wolverson Fitness — UK brand, excellent quality, free shipping over £50
- Bulldog Gear — competition and cast iron, UK-based, strong reputation
- Gravity Fitness — good value competition bells
- Amazon UK — wide selection but quality varies. Stick to known brands (Wolverson, Bulldog, Decathlon)
- Decathlon — budget-friendly, free returns, available online and in-store
In Person
- Decathlon stores — test the handle feel and weight in person. This is the single best reason to buy in-store.
- Argos — limited range but click-and-collect is convenient. York and Pro Fitness brands available.
- Sports Direct — cheap options but quality can be inconsistent. Check handle smoothness before buying.
Second-Hand
Kettlebells are virtually indestructible. A used cast iron bell performs identically to a new one. Check Facebook Marketplace, Gumtree, and eBay for second-hand bells at 40-60% of retail. Inspect handles for rust and rough spots — a quick sand and oil restores most used bells to like-new condition.
Frequently Asked Questions
What weight kettlebell should a beginner buy? For most men, 16kg. For most women, 8-12kg. These weights are challenging enough for swings and squats while being manageable for pressing movements. Start with one bell and add a second (lighter for presses, heavier for swings) within 2-3 months.
Is cast iron or competition better for home use? Cast iron is cheaper and perfectly adequate for home training. Competition bells offer consistent sizing across weights, which matters if you’re refining kettlebell sport technique. For general fitness, cast iron is the better value. For serious kettlebell work, competition bells are worth the extra cost.
How many kettlebells do I need? Start with one. Within 3-6 months, add a second at the next weight up. Most people eventually settle on 3-5 kettlebells covering a range from light (presses) to heavy (swings and squats). You don’t need them all immediately.
Can kettlebells replace a full gym? For most people, yes. A kettlebell collection covering 3-4 weight increments allows you to train every major movement pattern: pushing, pulling, hinging, squatting, and carrying. The only things kettlebells don’t replicate well are heavy barbell lifts (bench press, deadlift at very heavy loads) and machine-based isolation work.
Do kettlebells damage floors? Cast iron on hard flooring can chip tiles and dent wood. Use a rubber mat (about £15-25 for a 1×1 metre interlocking mat from Amazon UK or Decathlon) or choose vinyl-coated kettlebells for floor protection. Always set kettlebells down — never drop them.