I stongly recommend this pedal wheelchair (see links below) to all those boys who start having difficulties walking:

http://www.pedalwheelchair.com/

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Customer%20Flyer%20%282%29%20-%20GOxCy%2030%20by%20Healthpedal%20-%...

This pedal wheelchair offers, I think, wonderful physiotherapy and fun as it's easy to ride. Much better than a usual wheelchair for all those who kept some strength in their legs.