what size would be right for a typical third grader?

Probably the 15-inch stool would work fine. However, kids grow so fast that maybe an 18-inch would be a better choice. My 5th grader LOVES it. Here is a link that might be helpful: https://www.wittfitt.com/products/hooki-stools/hokki.html

Does this stool give your abs a workout?

I would not classify the Hokki stool as workout equipment, but you are using core muscles to keep balanced therefore there is strengthening happening. So maybe abs are getting some workout.

Is this stool suitable for adults?

When ordering a Hokki stool, you need to be sure you are ordering the correct height. Your belly button should be at about the height of the desk top. This stool is absolutely wonderful for people who need to sit for long periods or have back problems. You will experience confort in your back with this stool as the sit bones are constantly given input to sit yourself erect. The moveemnt of the stool is also helpful for keeping your back happy. Mary (occupational therapist)

What is the top (the sitting surface) like? How cushioned is the sitting surface?

It is a non-slip surface, but not cushioned at all.

Hokki Vs America Stool Flexible Ergonomic Seating Stool For Kids

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌀 Move More, Think Better — The Stool That Keeps Up With You!

SLIP RESISTANT BASE - Soft padding keeps you steady while allowing natural motion.
DURABLE YET LIGHTWEIGHT - Polypropylene body ensures stability without the bulk—easy to move and clean.
CORE STRENGTH POSTURE BOOST - Encourages healthy posture and strengthens core muscles during use.
ERGONOMIC DESIGN FOR ALL AGES - 20-inch seat height fits teens to adults, perfect for home or office.
ACTIVE SITTING ACTIVE THINKING - Transforms sitting into dynamic movement to boost focus and creativity.

The Hokki VS America Stool is a 20-inch high ergonomic seating solution designed for kids and adults who benefit from active sitting. Featuring a unique convex base that allows 360-degree movement, it promotes physical well-being and intellectual engagement. Made from durable polypropylene with a slip-resistant soft base and foam seat cushion, it supports up to 242 lbs while encouraging better posture and core strength. Ideal for classrooms, offices, or home environments where focus and movement go hand in hand.

Specifications

ASIN	B005JZ81NE
Assembly Instructions Description	Basic assembly required. Instructions included.
Best Sellers Rank	#2,379,271 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #123 in Kids' Stools
Brand	Hokki
Brand Name	Hokki
Color	Blue
Customer Reviews	4.8 out of 5 stars 47 Reviews
Frame Material	Polypropylene (PP)
Frame Material Type	Polypropylene (PP)
Furniture Finish	Plastic
Included Components	As Specified
Item Depth	5.35 inches
Item Dimensions	13.6 x 13.6 x 20 inches
Item Dimensions D x W x H	13.6"D x 13.6"W x 20"H
Item Weight	7 Pounds
Leg Style	Splayed
Manufacturer	Hokki
Manufacturer Part Number	382520BLC02952B
Manufacturer Warranty Description	1 year limited warranty.
Material Type	Polypropylene
Maximum Weight Recommendation	242 Pounds
Model Number	382520BLC02952B
Number of Items	1
Number of Pieces	1
Product Care Instructions	Spot or Wipe Clean
Product Dimensions	13.6"D x 13.6"W x 20"H
Required Assembly	No
Seat Height	20 Inches
Seat Material	Polypropylene (PP)
Seat Material Type	Polypropylene (PP)
Seat Width	13.5 Inches
Shape	Round
Size	20 inch
Style Name	Simple
UPC	783611447012
Unit Count	1.0 Count

Reviews

H**.

17.01.2015

J**E

19.06.2015

J**R

9.09.2016

J**Z

27.08.2013

D**7

14.12.2017

I**R

23.07.2015

J**Y

13.10.2015

J**R

16.10.2012

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