Waist Exercise · Medicine Ball

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One Arm Slam (with Medicine Ball)

Category

Waist

Equipment

Medicine Ball

Target

Abs

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Biomechanical cues verified by the PlanWorkouts Science Review Board under CSCS editorial oversight; see our editorial standards.

Slamming a medicine ball to one side trains the obliques and shoulders together through a rotational, explosive pattern rather than the straight-ahead force of a standard overhead slam. The rotation is what makes this a core exercise as much as a shoulder one.

How to Do the One Arm Slam (with Medicine Ball)

1. Set your feet shoulder-width apart and hold the medicine ball in one hand at waist level.
2. Soften your knees slightly and brace your core.
3. Lift the ball overhead, straightening your arm fully.
4. Drive the ball hard into the ground, generating force from your core and shoulder.
5. Catch the ball as it bounces back up and continue for the desired number of reps.

Biomechanical & Joint Load Cues

Trunk flexion, anti-extension, or anti-rotation targeting rectus abdominis and obliques. Requires posterior pelvic tilt to isolate abdominal fibers.

Common Mechanical Mistakes & Form Errors to Avoid

• Pulling on the Neck / Cervical Spine: Yanking the head forward with hands during crunches places excessive strain on cervical vertebrae without engaging the abs.
• Arching Lower Back Under Load: Allowing the lumbar spine to hyperextend during leg raises shifts work to the psoas hip flexors and pinches facet joints.
• Rushing Through Reps: Using fast bouncing tempo bypasses deep transverse abdominis engagement; slow reps with a full exhale build real core strength.

Proper Breathing Patterns & Core Engagement

Exhale completely during spinal flexion or maximal tension to maximize abdominal contraction; inhale on controlled return.

Injury Modification & Joint Safety

Individuals with lumbar disc herniations should prioritize isometric anti-extension (planks, dead bugs) over repetitive loaded spinal flexion. If joint irritation persists, immediately stop and substitute this movement with another exercise from the Waist exercises category.

Muscles Worked

The One Arm Slam (with Medicine Ball) primarily targets the Abs, with Shoulders as the primary synergist muscle group, along with the Back.

More Waist Exercises

3/4 Sit-Up Body Weight · Abs 45° Side Bend Body Weight · Abs Air Bike Body Weight · Abs Alternate Heel Touchers Body Weight · Abs Arm Slingers Hanging Bent Knee Legs Body Weight · Abs Arm Slingers Hanging Straight Legs Body Weight · Abs

More Abs Exercises

Arms Overhead Full Sit-Up (male) Body Weight · Abs Assisted Hanging Knee Raise Assisted · Abs Assisted Hanging Knee Raise With Throw Down Assisted · Abs Assisted Lying Leg Raise With Lateral Throw Down Assisted · Abs Assisted Lying Leg Raise With Throw Down Assisted · Abs Assisted Motion Russian Twist Medicine Ball · Abs

Equipment Alternatives

Don't have medicine ball? These target the same abs with different equipment.

Arms Overhead Full Sit-Up (male) Body Weight · Abs Assisted Hanging Knee Raise Assisted · Abs Band Alternating V-Up Band · Abs Barbell Press Sit-Up Barbell · Abs

FAQ

What muscles does the One Arm Slam (with Medicine Ball) work?

The One Arm Slam (with Medicine Ball) primarily targets the abs as the primary agonist. Synergist assistance is provided by the shoulders along with the back. Maintaining strict biomechanical alignment ensures maximal tension remains focused on the intended muscle fibers rather than shifting to surrounding stabilizer joints.

What equipment do I need for the One Arm Slam (with Medicine Ball)?

The One Arm Slam (with Medicine Ball) is performed using a medicine ball. Ensure all equipment is securely positioned with collars or safety pins locked before loading working sets. If you train in a home gym or minimal setup, explore our equipment-free and resistance band alternatives below.

What is the most common form mistake on the One Arm Slam (with Medicine Ball)?

The most frequent error is pulling on the neck / cervical spine: Yanking the head forward with hands during crunches places excessive strain on cervical vertebrae without engaging the abs.. Controlling the 2 to 3-second eccentric lowering phase ensures maximal hypertrophic stimulus while shielding connective tissue.

How many sets and reps should I perform on the One Arm Slam (with Medicine Ball)?

For muscle growth and density, execute 3 to 4 working sets of 10 to 15 controlled repetitions with 60 seconds rest, emphasizing a deep stretch and deliberate peak contraction on every rep.

What's a good alternative to the One Arm Slam (with Medicine Ball)?

If you don't have access to a medicine ball, the Arms Overhead Full Sit-Up (male) targets the same abs using body weight instead. This alternative replicates the same joint angle and movement plane while allowing you to train effectively with different available gear. You can also substitute it seamlessly in our free Workout Plan Builder.