4 lb medicine ball
Skip itA small market ($77K/yr) — this niche doesn't clear our bar today.
Avg price
Incredible$25.95avg listing price — sweet spot $15–$100
Price range
Great$10.89–$41.76cheapest to priciest tracked listing — scored on the share inside $15–$100
Conversion
Great8.5%search→purchase rate — share of searches ending in a sale
Returns
Good2.2%return rate — above 6% kills the launch gate
Growth
Okay+17.7%90-day search growth — must beat 0% to launch
Review moat
Okay3,251.33avg incumbent reviews — the moat a new listing must climb
Brand share
Okay88%top-5 brand share — brands hold most of the demand
Competition
Okay69%top-5 click share — leaders hold, buyers still browse
Quality gap
Bad4.6★avg incumbent rating — lower means beatable quality
Market size
Bad$77K$77K/yr · 35K searches
According to Flapen's Amazon United States niche tracking, 4 lb medicine ball is a $77K/yr Amazon United States market (35K searches/yr). The top 5 brands hold 88% of demand. Verdict: Skip it — 45/100.
Data updated Jul 17, 2026 · scored weekly · How we score niches
4 lb medicine ball market data
- Units sold / yr
- 3K–4K
- avg 250–500/product
- Revenue / yr
- $78K–$104K
- units × avg price
- Launch success
- —
- 0 of 0 new (360d)
- Conversion rate
- 8.5%
- Avg BSR
- #34
- Page quality
- 0%
- Prime
- 100%
- Sponsored
- 86%
- Out of stock
- 3.0%
- Avg brand age
- 76 months
- Avg seller age
- 203 days
Competition & brand share
The top 5 products take 69% of clicks — established leaders, but buyers still shop beyond them.Brands
12 rising
Sellers
27
Top-5 brand share
88%
Top 20: 100%
Top-5 click share
69%
Top 20: 99%
Open market
9%
- Champion Sports23%
- Amazon Basics22%
- ProsourceFit20%
- RitFit16%
- Sunny Health & Fitness6%
- Logest4%
- Open — no brand owns it (6 brands, 9%)
Demand & seasonality
Weekly Amazon search volume, last 102 weeks — +17.7% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.6×
Top 4 lb medicine ball search terms
- 4lb medicine ball12K/yr
- 4 lb medicine ball7K/yr
- medicine ball 4 lbs5K/yr
- 4 pound medicine ball5K/yr
- 4 lbs medicine ball6K/yr
Top 4 lb medicine ball products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 21 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Amazon Basics Weighted Medicine Ball for Core Strength Strength Training Full-Body Workouts and Balance Exercises 4 Pounds Green/Black
Amazon Basics$20.174.8★13,637 rev
ProsourceFit Weighted Medicine Ball for Full Body Workouts
ProsourceFit$25.254.8★805 rev
RitFit Weighted Medicine Ball - Non-Slip Rubber Shell & Dual Texture Grip - Workout Exercise Ball for Core Strength Balance Training Coordination Fitness - Multiple Weights & Colors
RitFit$31.174.5★413 rev
Champion Sports PRX4 Rhino Promax Elite Slam Balls 4 lb Soft Shell with Non-Slip Grip Medicine Wall Exercise Ball for Weightlifting Plyometrics Cross Training & Home Gym Fitness
Champion Sports$41.764.3★1,151 rev
Sunny Health & Fitness 4LB Medicine Ball Textured Rubber Core Strength & Balance Training Bouncing Weight for Home Workouts SF-EB03-4
Sunny Health & Fitness$31.474.7★13 rev
Newest
by launch dateSunny Health & Fitness 4LB Medicine Ball Textured Rubber Core Strength & Balance Training Bouncing Weight for Home Workouts SF-EB03-4
Sunny Health & Fitness$31.4713 rev
Logest Weighted Toning Exercise Balls Pair - Round Shape Medicine Ball - 1LB 2LB 3LB 4LB 5LB 6LB Available - Toning Muscle for Men & Women - Color-Coded Difficulty Levels (4LB - Pair)
Logest$25.85165 rev
Logest Weighted Toning Exercise Balls Pair - Round Shape Medicine Ball - 1LB 2LB 3LB 4LB 5LB 6LB Available - Toning Muscle for Men & Women - Color-Coded Difficulty Levels (1LB - Pair)
Logest$17.44165 rev
Retrospec Core Weighted Medicine Ball 4 6 8 10 12 14 16 20 25 30 lbs Soft Touch Vegan Leather with Sturdy Grip for Strength Training Recovery Balance Exercises and Other Full-Body Workouts
Retrospec$29.76497 rev
JFIT Soft Wall Medicine Ball 4 LB Blue/Black
JFIT$36.022,204 rev
Trending
90-day click momentum
Champion Sports Rhino Gel Filled Medicine Ball (Blue 4 lbs)
Champion Sports$17.184.6★
Sunny Health & Fitness 4LB Medicine Ball Textured Rubber Core Strength & Balance Training Bouncing Weight for Home Workouts SF-EB03-4
Sunny Health & Fitness$31.474.7★
ProBody Pilates Exercise Ball - Multiple Sizes Gym Grade Balance Ball for Fitness Workout Pregnancy & Physical Therapy Stability Yoga Ball Chair (Blue 65cm)
ProBody Pilates$18.604.5★
Logest Weighted Toning Exercise Balls Pair - Round Shape Medicine Ball - 1LB 2LB 3LB 4LB 5LB 6LB Available - Toning Muscle for Men & Women - Color-Coded Difficulty Levels (1LB - Pair)
Logest$17.444.6★
Rubber Medicine Ball - 4.4 lb. - Red
BSN SPORTS$31.944.6★
What buyers say about 4 lb medicine ball
What buyers praise and complain about, mined from review topics.What buyers love
“Amazing quality”
“Worth the price”
“Good size”
“Durable”
“terrific for yoga”
“Easy to inflate”
“Easy to use”
“Easy to grip and pick up”
“It works”
“I really liked the material”
What buyers complain about
“Smells like rubber”
“Cheap”
“Deflates too easy”
“Leaks air”
“too big for the hand”
“Impractical surface materials”
“making the ball sticky”
“its VERY hard to get the stuff off”
“stretch my hips no can stretch my hamstrings too”
“out of balance when it hits the floor that it rolls too far out of reach”
Top return reasons
Common questions
- Is 4 lb medicine ball profitable to sell on Amazon United States?
- The niche generates $77K/yr across 21 tracked products. 90-day search growth is +17.7%. Flapen's verdict: Skip it (45/100).
- How competitive is the 4 lb medicine ball niche?
- 12 brands and 27 sellers compete. The top 5 products take 69% of clicks and top 5 brands hold 88% of demand.
- What do buyers complain about in 4 lb medicine ball?
- Top complaints mined from reviews: Smell, Quality-Overall, Inflation/Deflation. The return rate is 2.2%.
- When does demand for 4 lb medicine ball peak?
- Demand is steady year-round — the busiest month runs 1.6× the quietest.
- What does it cost to enter the 4 lb medicine ball niche?
- Listings span $10.89–$41.76; the average listing price is $25.95 (sweet spot $15–$100). The average incumbent carries 3,251 reviews — the moat a new listing must climb.