Rotating chair with dumbbells or weighted bicycle wheel.

The three dumbbells. A sturdy chair with arm rests is mounted on a ball-bearing axle. A person seated in the chair holds a heavy 'dumb-bell' weight in each hand, with arms extended. The chair is rotated and the seated person draws the weights in to the body to increase the speed of rotation. The chair may be slowed by extending the weights. Note: a bicycle wheel with weighted rim and long handle, and bicycle wheel with 2 handles are available as gyros on request.
UCB Index: 
A+30+15
PIRA Index: 
1Q40.10
Demo Diagram: 
Demo Picture: 

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for 5 sept class