SBC Equipment Selection and Maintenance 2 — Questions and Answers
Question 1: Which material is most commonly used in the construction of high-quality stability balls?
- Natural latex
- PVC (polyvinyl chloride) (Correct answer)
- Neoprene rubber
- High-density foam
Correct answer: PVC (polyvinyl chloride)
Most stability balls are constructed from PVC, which offers a balance of flexibility, durability, puncture resistance, and cost-effectiveness suitable for fitness applications.
Question 2: What is the recommended stability ball size for a client who is 6'0" or taller?
- 55 cm
- 65 cm
- 75 cm (Correct answer)
- 85 cm
Correct answer: 75 cm
Clients who are 6'0" or taller generally require a 75 cm ball to maintain proper 90-degree hip and knee angles when seated.
Question 3: What is the best practice for cleaning a stability ball after use in a group fitness class?
- Submerge the ball in a disinfectant solution
- Wipe with a damp cloth using a mild soap or disinfectant spray approved for rubber/PVC (Correct answer)
- Use alcohol-based sanitizer directly on the surface
- Only dry-wipe to avoid moisture damage
Correct answer: Wipe with a damp cloth using a mild soap or disinfectant spray approved for rubber/PVC
Stability balls should be cleaned with a mild soap solution or disinfectant specifically approved for PVC/rubber, as harsh chemicals like undiluted alcohol can degrade the material.
Question 4: When storing stability balls in a fitness facility, which storage method is most appropriate?
- Stack them in a pyramid formation
- Store in a ring rack or ball bin that supports them without stacking pressure (Correct answer)
- Deflate completely and store flat
- Hang them from ceiling hooks using bungee cords
Correct answer: Store in a ring rack or ball bin that supports them without stacking pressure
Ring racks and ball bins provide stable, supported storage that prevents balls from rolling, becoming deformed from pressure, or creating trip hazards.
Question 5: A stability ball that feels soft and deforms significantly under moderate pressure most likely needs which intervention?
- Replacement because it has exceeded its lifespan
- Additional inflation to restore proper firmness (Correct answer)
- A surface patch kit applied to seal micro-leaks
- Reduced use until a new ball arrives
Correct answer: Additional inflation to restore proper firmness
A soft ball typically just needs more air; balls naturally lose some pressure over time and should be re-inflated to the manufacturer's recommended diameter.
Question 6: Which tool is typically used to inflate a stability ball to the correct size?
- Standard bicycle pump with a needle adaptor (Correct answer)
- Industrial air compressor set to 60 PSI
- Oral inflation without any tool
- Vacuum pump with reverse setting
Correct answer: Standard bicycle pump with a needle adaptor
A standard hand or foot pump with a needle adaptor (similar to those used for sports balls) is the correct tool for inflating stability balls to the manufacturer's recommended diameter.
Question 7: Why is it important to allow a newly purchased stability ball to acclimate before measuring it to its final inflated diameter?
- New balls need time to develop anti-slip texture
- The PVC material needs to stretch and settle before reaching the specified diameter (Correct answer)
- New balls contain chemicals that need to off-gas first
- Manufacturer stickers must dry before the ball is fully inflated
Correct answer: The PVC material needs to stretch and settle before reaching the specified diameter
New PVC stability balls need to be partially inflated, allowed to stretch and settle for 24 hours, then inflated to their final specified diameter for accurate sizing.
SBC Equipment Selection and Maintenance 2
Which material is most commonly used in the construction of high-quality stability balls?