This is what one site says about the bike
Child Exercise Bike. Features adjustable valve to increase or decrease the effort required. An electronic watch shows time, distance, energy and more, adds to the feel good factor when using the exercise bike. Solidly constructed from tubular steel with protective foam padding for comfort. Can be used indoors or outdoors subject to a suitable flat surface.
Suitable ages 3 -9 years. Maximum weight of 68 kg / 150lb. Approximate dimensions: 51 x 23 x 49 cm. Saddle height max is 46cm.
This range of children's fitness equipment is the fun way to help improve and maintain a child's fitness levels. It encourages active "play" in a safe environment and is ideal for use when helping your child lose weight, or to help promote and improve their general stamina and fitness. Trialed in the NHS, schools and sports clinics, it's now available to the domestic market. Of course, there's no substitute to your child having a healthy, balanced diet and an active interest in energetic activity, whether through sports, swimming, trampolining, dance or yoga, and it's important to encourage children of all ages into any of these activities where possible.