You will absolutely not gain muscle if you don't use them. You also won't gain muscle if you don't eat more calories than you burn. It's correct that you don't need to go to the gym or even use weights to add weight, but it's the best way. There are activities that will add mass, like swimming, but you still need to do it enough and do it the right way. Ultimately, you just need to be challenging and overloading your muscles somehow so they adapt and grow.
somebody please tell me because i got big muscles for my age (11) but i want be ripped and have a six pack and have huge bi-ceps and tri-ceps
A 13 year old can get ripped by eating right and exercising. Lifting weights is one way to get ripped at any age.
Treadmill is great for cardio and overall weightloss but won't get you 'ripped,' for that you need strength training. It would be easier at a gym but do what you can! Situps, pushups, pullups, crunches, stair steps...find/make some kind of weights to curl & lift. Use whatever you can: bricks, buckets of water, a sledgehammer...whatever is heavy around the house.
if you do become 'ripped', you will stay at the same height and it will stunt your development.
They shouldn't, it would damage their muscles
nope
Yes they are.
NO
bench press and lift weights and start with 25 or 50 ones then work your way up and 4 sets of 25 pushups a day
Yes
Slightly Overweight
9 inches if off weights, depends on weight aswell, on weights over 10
Foods that are high in protein, such as lean meat like chicken.