Weight Training.
When you excercise, workout or whatever an acid is produced that basically damages your muscles. When your muscles try to recover from this they become larger from the scar tissue formed by the healing process this also explains the pain experienced the day after.
because they are larger
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helps stamina
If you exercise a lot, it should be totally normal to have larger muscles.
Muscles form by being torn (soreness) and then they are rebuilt with proteins and are larger.
Yes. But it means you would have to bike a lot. Thigh muscles grow larger with time, so you need patience.
Light weight training builds lean muscle. Heavy weight training creates larger tears in the muscles, causing them to rebuild aggressively. Use dumbbells that are no more than 10 pounds for your biceps.
Most other muscles are larger and all are located below the human head.
This is the mastoid process of the temporal bone. It is somewhat larger in males than females. It is normal to be there. There are four muscles attached to it. It is larger in men because they have larger muscles.
Push-ups
If you mean how do your muscles get larger, they get larger if they are used more often, but it may depend on what kind of training you do. If you mean fat, the muscle doesn't actually turn into fat, instead, the fat cells get larger and overtake the muscle mass.