Do you not want to go to the gym because you don't want to workout? Or is it because you want to make gains without machines or weights? If it's the former, then get implants. If it's the latter, then go crazy with push-ups and isometrics.
bring the gym to you.
go to the gym
Heredity
Do PILATES. Read about it then practice.
Eat healthy
Yes. It is baseless. You must exercise these muscles vigorously and regularly to achieve muscle growth and strength.
No, going to the gym does not make you shorter.
Learn to ice-skate.
When he went to fight the Cerulean City gym leader, her 3 sisters were going to give him the badge without fighting, so she stepped up to uphold the honor of the gym.
Usually Gym bike means stationary exercise bike, what you can use to cycling in a indoor home or gym environment. You can do cycling in indoor without going anywhere. Basically, it is a fixed bike on a frame.
Running and biking are great exercises.
The only way you can gain weight by not going to the gym is to pig out and over eat. If you maintain a healthy life style and eat properly you shouldn't get fat, but you will loose muscle size, and strength