no just keep practicing
by sturdy if you mean durable,any bike $300+ will probably last a couple years(depending on how hard you ride).
bars pedals wheels sprockets forks seat
If you're asking if it's difficult to ride a bicycle the answer is yes. It does take quite an effort to learn how to ride them.
I chose the mountain bike for your ride.
No, it is illegal to ride a dirt bike on the street but you can ride it on a trail or dirt bike track.
If you ride hard enough to get your breathing and heart rate up - yes.
gravity limits us because its hard to ride a bike up hill
because the traction on the mountain bike tires have more of a grip to be able to ride on a mountain when a road isn´t that hard to ride on and to need more traction.
Get a bike and ride it
You ride a bike because it has to be balanced by the operator.
It depends on how fast you can ride a bike!
Riding a tandem bike can be challenging at first, as it requires coordination and communication with your partner. With practice and teamwork, it can become easier and more enjoyable.