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Muscles are what makes your body move, whatever you do. So you need them for bike riding too.
Most likely you would need to get a note from your Doctor excusing you from bike riding. Check with your specific school policy for the current rules.
Well yes, I you're riding a motorcycle. You even need a bike helmet when riding a bike. Seatbelts in cars, etc.
Between ground and tires and between brake pads and moving surface.
I am riding on bike since 1996.
Exercise as a rule is good, and bike riding is a fairly mild exercise form - but you need to consult your doctor.
well its the same question as why would you need balance to ride a bike. because if you dont have balance you wont get very far.
when you are riding it lol, jk, when you dont need it
when you are riding it lol, jk, when you dont need it
If you are talking about riding it on the strets, yes you will need a license.
about 50-60 psi for uphill riding
Easiest thing would be for you to do a search of different bike types, look at the pics and see which one that come closest to matching your bike