Slam balls and medicine balls look similar and are used for some of the same exercises, but they are fundamentally different pieces of equipment with different constructions, different bounce properties, and different ideal applications. Using the wrong one for a given exercise either reduces the effectiveness of the training or creates a safety hazard.
This guide covers exactly what makes each different, which exercises each is designed for, and how to decide which one (or both) makes sense for your training.
What Each Ball Is
Medicine Ball
A medicine ball is a weighted ball designed for throwing, catching, and rebounding exercises. It is typically constructed with a rubber shell (sometimes textured for grip) around a weighted inner core. Medicine balls are designed to bounce when thrown against a wall or floor, making them appropriate for exercises where the athlete catches the rebound and immediately throws again.
Construction: Rubber outer shell, weighted filling (gel, sand, or air depending on type), designed to maintain shape under repeated impact.
Bounce: Yes. Medicine balls bounce predictably off solid walls and firm floors, allowing rebound-based exercises.
Weight range: Typically 1 to 15 kilograms in commercial settings, though heavier versions exist.
Durability: High, but they can crack or deform if repeatedly slammed against very hard surfaces beyond their intended use.
Slam Ball
A slam ball is specifically designed to be slammed against the floor with maximum force and to absorb that impact without bouncing back. It is constructed with a thick rubber shell filled with dense sand or iron powder, producing a ball that deforms slightly on impact to absorb the force and remains where it lands.
Construction: Thick textured rubber outer shell, dense sand or iron-powder filling, designed to absorb maximum impact forces.
Bounce: Minimal to none. This is the defining feature. A slam ball thrown against the floor stays where it lands rather than rebounding into the athlete.
Weight range: Typically 5 to 50 kilograms, with heavier options than medicine balls because they are not intended to be caught after high-velocity throws.
Durability: Very high. Designed specifically to withstand repeated maximum-force impacts against the floor.
The Key Differences
| Feature | Medicine Ball | Slam Ball |
|---|---|---|
| Bounce | Yes (designed to rebound) | No (designed to absorb impact) |
| Shell thickness | Thinner | Thicker |
| Weight range | 1 to 15 kg (typically) | 5 to 50 kg (typically) |
| Filling | Gel, air, or sand | Dense sand or iron powder |
| Surface texture | Smooth or lightly textured | Heavily textured (grip) |
| Primary use | Throwing and catching | Slamming against floor |
| Appropriate for wall throws | Yes | No (can damage wall or bounce unpredictably) |
| Appropriate for floor slams | With caution (may bounce back dangerously) | Yes (specifically designed for this) |
Which Exercises Each Ball Is Best For
Exercises Best Done With a Medicine Ball
Wall throws (any direction):
The entire range of medicine ball wall throws covered in the medicine ball throws for baseball and abdominal workouts with medicine ball articles on this site — rotational throws, chest throws, overhead throws, shovel passes — require a ball that bounces predictably off the wall. The rebound allows the athlete to catch and immediately throw again, developing the reactive power that is the purpose of these exercises.
Using a slam ball for wall throws is not ideal: the non-bouncing characteristic means the ball will not rebound cleanly, disrupting the rhythm of the exercise and potentially making the ball difficult to catch.
Partner throws:
Medicine ball chest throws, overhead passes, and rotational passes to a partner require a ball that travels predictably through the air and can be caught comfortably. The medicine ball’s construction and weight range makes it appropriate for throwing and catching with a partner.
Ball-between-knees exercises:
Exercises where the ball is held between the knees or squeezed between the hands (dead bugs, inner thigh squeezes as covered in the leg exercises with stability ball and abdominal workouts with medicine ball articles on this site) are better performed with a medicine ball. A heavy slam ball between the knees is impractical and potentially dangerous.
Goblet squats and loaded exercises:
When using a weighted ball as a load for squats, lunges, or Romanian deadlifts, the medicine ball’s lighter weight range and easier grip make it more appropriate than a heavy slam ball.
Wall sit exercises:
As covered in the medicine ball wall squat article on this site, holding a medicine ball at the chest during a wall squat is a specific exercise. The medicine ball’s appropriate size and weight for this application is typically 4 to 8 kilograms — within the medicine ball range but potentially at the lower end of the slam ball range.
Exercises Best Done With a Slam Ball
Floor slams (overhead slam):
As covered in the abdominal workouts with medicine ball article on this site, the overhead slam involves throwing the ball toward the floor with maximum force. With a standard medicine ball, the ball bounces back from the floor and can strike the athlete in the face or cause them to lose balance catching the rebound. The slam ball’s non-bounce characteristic makes it the only safe option for this exercise at maximum effort.
Rotational floor slams:
A variation of the overhead slam where the ball is slammed diagonally toward the floor on one side. The same non-bounce requirement applies.
High-intensity conditioning slams:
When using slam-to-floor exercises as a conditioning tool (high volume, high intensity, rapid continuous slams), the slam ball’s durability and non-bounce characteristic make it the only appropriate choice. A medicine ball would deteriorate rapidly under this type of use and would bounce unpredictably at high repetition volumes.
Very heavy rotational exercises:
When athletes need a very heavy ball (20 kilograms or more) for rotational exercises, the slam ball’s weight range extends far beyond the medicine ball’s typical upper limit.
Exercises That Can Use Either Ball
Woodchops:
The diagonal chopping motion does not require a rebound or a floor slam, making either ball appropriate depending on the desired weight.
Russian twists:
The seated rotational exercise does not require throwing or slamming. Either ball works, with the choice depending on the desired weight.
Farmer’s carry:
Walking while carrying a weighted ball is not specific to either type. The medicine ball’s lighter range is typically more appropriate for this exercise.
Core exercises (Russian twist, side bends, trunk rotation):
Any exercise where the ball is held rather than thrown or slammed can use either type.
What Happens When You Use the Wrong Ball
Medicine ball slammed against the floor at maximum effort:
The ball bounces back unpredictably. At high effort levels, the rebound can travel high enough to strike the athlete in the face. Even at lower effort levels, the unpredictable bounce disrupts the rhythm of the exercise and redirects the athlete’s attention to catching rather than generating maximum power. Over repeated heavy slams, the rubber shell of a standard medicine ball can crack.
Slam ball thrown against a wall:
The ball’s thick, textured surface and non-bounce construction means it will not rebound cleanly from the wall. It may stick to the wall briefly, fall unpredictably, or bounce sideways rather than directly back. The heavier slam balls (15 kilograms or more) thrown against a wall risk damaging the wall surface and produce a rebound that is difficult to control safely.
Do You Need Both?
The answer depends on the exercises you plan to perform.
You only need a medicine ball if:
- Your training consists primarily of wall throws, partner throws, and loaded holding exercises
- You do not perform overhead slams or floor slams regularly
- You train in a space where a non-bouncing ball is not a priority
You only need a slam ball if:
- Your training consists primarily of floor slams and high-intensity slamming conditioning
- You want a very heavy ball (above 15 kilograms) for rotational exercises
- You do not perform wall throw or rebound exercises
You benefit from both if:
- You perform both wall throw exercises (chest throws, rotational throws) AND floor slam exercises
- Your training programme includes exercises from both the medicine ball and slam ball categories described above
The most common home gym recommendation:
For most home training athletes who follow the medicine ball programmes covered in this site’s articles on core training, baseball throws, and sports performance, a single medicine ball in the 4 to 6 kilogram range covers the majority of exercises effectively. Add a slam ball (10 to 15 kilograms) if overhead slams are a regular component of the training programme.
How to Choose the Right Weight
Medicine Ball Weight Selection
As covered in the medicine ball chest throw and abdominal workouts with medicine ball articles on this site, the medicine ball weight depends on the exercise:
- Power throws (rotational wall throws, chest throws, partner throws): 3 to 6 kilograms for most athletes. The ball should move at speeds that feel similar to the sport movement being trained.
- Strength exercises (goblet squats, Russian twists, loaded holds): 6 to 12 kilograms depending on strength level.
- A 4 to 6 kilogram medicine ball covers most exercises for most athletes.
Slam Ball Weight Selection
- Conditioning slams (high volume): 10 to 15 kilograms for most athletes.
- Power-focused slams (low volume, maximum effort): 15 to 20 kilograms for stronger athletes.
- A 10-kilogram slam ball is the most versatile starting point for most athletes.
Buying Guidance
Budget:
Both types range from budget options (£20 to £30) to premium versions (£60 to £100). The primary quality indicators are shell durability (the shell should feel solid and consistent without soft spots), filling consistency (the ball should feel uniformly weighted when rotated), and surface texture (sufficient for grip without being excessively abrasive).
Brands:
Rogue, Dynamax, Rep Fitness, and Trideer are well-regarded brands for medicine balls. For slam balls, Rogue, Titan Fitness, and Amazon Basics slam balls are popular choices at various price points.
For home gym equipment, prioritise:
- Shell quality (cheap balls develop cracks and deform with regular use)
- Appropriate weight for the intended exercises (do not buy too heavy to begin with)
- A ball that matches the exercise type (do not substitute slam ball for medicine ball or vice versa for the exercises where the difference matters)
Frequently Asked Questions
Can I use a slam ball instead of a medicine ball for everything?
For exercises that do not involve wall throws or partner catches, yes. For wall throws and rebound exercises, no — the slam ball’s non-bounce characteristic makes these exercises impractical. If budget allows only one ball, a medicine ball covers more exercise types than a slam ball, as most medicine ball exercises do not strictly require a non-bouncing ball, while slam exercises strictly require one.
Can a heavy medicine ball be used for floor slams?
With caution and reduced effort. A medicine ball used for floor slams at moderate effort (not maximum) will bounce less than at maximum effort, making it more manageable. However, at any significant effort level, the rebound is unpredictable and potentially dangerous. If floor slams are a regular part of training, a slam ball is the appropriate tool regardless of whether a medicine ball is available.
Is a slam ball heavier than a medicine ball?
Generally yes, because slam balls are available in much heavier weights (up to 50 kilograms) than standard medicine balls. However, the weight overlap exists in the 5 to 15 kilogram range where both are available. The distinction is not primarily about weight but about construction and bounce characteristics.
What is a dead ball?
A dead ball is another name for a slam ball — it refers to the non-bouncing characteristic (the ball is “dead” on impact). The terms are used interchangeably.