Mainly lower body muscles - legs, feet etc. But the upper body does get some use.
leg muscle
Pretty much all of them.
There several muscles and joints which are used when riding a bicycle. Some of them include wrist joint, knee joint, hamstring muscles, quadriceps and the calf muscles among others.
Riding on sidewalks is usually illegal for adults/full-sized bikes.The rest is down to how powerful/fast the electric bike is.Bikes with fairly weak (assist) motors are usually treated the same as pedal bikes.But if it has the power of a scooter/moped, then it'll go by the same laws as a scooter/moped.
Buy a used scooter for cheap, or a new moped for safe. If you are riding a bike be sure and have a helm on. A new moped is probably your best bet. If you are REALLY low on cash try to find a used scooter try the local ads in the papers. If you have enough time perhaps try ebay.
Using an exercise bike works your glutes and hip flexors, plus leg muscles.
The type of bike that is mostly used form BMX riding are the purpose-built BMX bikes.
http://willapse.hubpages.com/hub/Best-Electric-Scooter
In the commercial the singer is riding, what looks like, an old Schwinn touring bike. You can get a similar bike used online or at a local bike shop.
I can tell you the answer for a road bicycle. Every single muscle gets developed with one exception - the abdominal area. I don't think you will ever get as good a workout on a stationary bike, but the principles remain the same.
they used their biggest muscles,the thigh muscle.
"She used to go bike riding a lot last summer."